Hallisey started working on the test one year ago when she saw Ebloa spreading across African countries. Her research was based on looking at and using previous research and her own creative ideas.

“She deserves all the praise she’s getting for her hard work, dedication, and intelligence,” said her science teacher Andrew. “Her project is very helpful for the medical diagnosis that we need in parts of the world where Ebola is most common.”

　　“What affects one country affects everyone,” Hallisey told CNBC. “We have to work together to find answers to the challenges that threaten global health, our environment and our world.”

　　21. According to the article, Olivia’s tests .

学习啦在线学习网 　　A. show changes in the color of blood if the person is infected.

学习啦在线学习网 　　B. use a person’s saliva, which is sorted at a low temperature.

　　C. are less time-consuming and less expensive than current tests.

学习啦在线学习网 　　D. are less time-consuming but more expensive than current tests.

　　22. What quality makes the test more convenient?

学习啦在线学习网 　　A. The material used needn’t be put in a special device.

　　B. The material used is easier to store in a refrigerator.

　　C. The material used can easily be produced in Africa.

　　D. The material used is common in the places where Ebloa is most common.

学习啦在线学习网 　　23. Which of the following statements is TRUE?

　　A. Olivia’s research began before the outbreak of Ebloa in Africa.

　　B. Olivia’s research was based on her own creative ideas.

　　C. Olivia set her mind on winning the 2015 Google Science Fair.

学习啦在线学习网 　　D. Olivia’s discovery could benefit the lives of many people.

　　B

学习啦在线学习网 　　Advances in health, education and disease prevention and treatments are making human life longer. But what you may not know is that some seemingly unimportant things can also influence how long and how well you’ll live. Here is the latest research on longevity signs.

学习啦在线学习网 　　Sign 1: Your Mom Had You Young

学习啦在线学习网 　　If she was under age 25, you’re twice as likely to live to 100 as someone born to an older mom. They think that younger moms produce healthier babies.

　　Sign 2: You’re a Tea Lover

　　Both green tea and black tea contain catechins(儿茶酚), something that helps blood vessels(血管) relax and protects your heart.

　　Sign 3: You’d Rather Walk

　　“Fit” people— defined as those who walk for about 30 minutes a day— are more likely to live longer than those who walk less. So take a walk during your lunch hour, do exercise around the field while your kid is at soccer practice— try by hook or by crook to move a little more, every day.

　　Sign 4: You Have Strong Legs

学习啦在线学习网 　　Lower-body strength translates into good balance, flexibility and power, which, as you get older, play an important part in reducing your risk of falls and injuries, leading to better health. Now you see, it is necessary to strengthen your lower-body. But the question is: how?

学习啦在线学习网 　　24. Which of the following is TRUE?

学习啦在线学习网 　　A. Green tea contains more catechins than black tea.

　　B. Generally, the younger the moms, the healthier the babies.

　　C. The more you walk, the longer you live.

学习啦在线学习网 　　D. Low-body strength is the most important factor for longevity.

　　25. The underlined phrase is closest in meaning to “ ”.

　　A. try any possible means B. use some tools

学习啦在线学习网 　　C. choose carefully D. Work out new ways

　　26. According to the text, your longevity is affected by things such as .

　　a. lower-body strength

学习啦在线学习网 　　b. disease treatments

　　c. your mom’s age

　　d. living habits

　　A. a, b, c B. a, c, d C. a, b, d D. b, c, d

　　27. What is the passage mainly about?

　　A. How advanced science helps people live longer.

　　B. How women give birth to healthy babies.

学习啦在线学习网 　　C. Signs that tell you your health condition.

学习啦在线学习网 　　D. The new discoveries of longevity signs.

　　C

　　The pickle jar, as I can remember, sat beside the dresser in my parents’ bedroom. When ready for bed, Dad would toss any coins in his pockets into the jar. As they dropped, they landed with a merry jingle.

　　Whenever the jar was full, Dad would roll up the coins. Every time he slid the box of rolled coins across the counter at the bank toward the cashier, he would smile proudly and say,“All for my son’s college.”

学习啦在线学习网 　　We would always celebrate each deposit by stopping for an ice cream cone. Dad would show me the coins in his change, saying “When we get home, we’ll start filling the jar again.” He always let me drop the first coins into the empty jar. “You might have to get to college on loose change,” he said. “But you’ll get there.”

　　As years passed, I went to college, got married and took a job.

学习啦在线学习网 　　Once, while visiting my parents, I noticed the jar was gone. It had served its purpose. My dad was a man of few words and never lectured me on the values of determination, perseverance or faith. The jar had taught me those far better than the most flowery of words could have done.

　　Soon, my daughter Jessica was born. We spent Christmas that year with my parents. After dinner, Mom and Dad sat next to each other, taking turns holding their first grandchild. When Jessica began crying, my wife Susan took her from Dad’s arms to put her in my parents’ room.

学习啦在线学习网 　　Susan came back, tears in her eyes and led me into the room. “Look,” she said softly. To my amazement, there, next to the dresser, stood the old pickle jar, as if never removed, the bottom already covered with coins. I walked over to it, dug down into my pocket, and pulled out several coins. Choked by emotion, I dropped them into the jar.

　　Dad had slipped quietly into the room when I looked up. Our eyes locked, but neither of us spoke, because we knew nothing had to be said.

学习啦在线学习网 　　28. Which of the following statements is TRUE?

　　A. The author felt disappointed when he found the jar gone.

学习啦在线学习网 　　B. The author and his wife were grateful for what parents had done.

学习啦在线学习网 　　C. The jar again in the bedroom reminded themselves of the hard years.

学习啦在线学习网 　　D. The author felt embarrassed whenever his father mentioned the jar.

学习啦在线学习网 　　29. We can learn from the passage that .

学习啦在线学习网 　　A. any difficulty can be overcome with the family’s support.

　　B. saving is always a good habit to pass down to the next generation.

学习啦在线学习网 　　C. parents teach much more through their action than their words.

　　D. you need to reward yourself and celebrate regularly to keep up with your faith.

　　30. Which words best describe the author’s father?

学习啦在线学习网 　　A. Quiet but loving.

学习啦在线学习网 　　B. Humorous and patient.

　　C. Generous and talkative.

　　D. Proud but strict.

　　31. The pickle jar in the article represents .

学习啦在线学习网 　　A. advice of parents.

　　B. determination to reach a goal.

学习啦在线学习网 　　C. healthy family relations.

学习啦在线学习网 　　D. one’s purpose in life.

　　D

　　Many of us remember cloned dinosaurs running wild in the film Jurassic Park. And the idea of using technology to revive extinct species has long fascinated writers, directors, and scientists.

　　According to The Telegraph, woolly mammoths(长毛猛玛象) may walk the earth once more, now that scientists have taken another step toward realizing a long-held dream-recreating their DNA. Mammoths became extinct around 10,000 years ago. However, since the discovery of near perfect preserved remains in Arctic permafrost(北极冻土带) in May 2013, a variety of research studies have been carried out since.

学习啦在线学习网 　　Geneticists analyzed DNA from the remains, looking for genes which separated mammoths from elephants, such as hairiness and ear size. They then used the results to reproduce exact copies of 14 mammoth genes. “It is the first time that mammoth genes have been alive-although so far it has only been done in the lab,” Gorge Church, lead researcher of the project, told the Saturday Times. Church then used a new technique which allows scientists to edit DNA carefully, replacing sections of elephant DNA with the mammoth genes. So “we now have functioning elephant cells with mammoth DNA in them”, he said.

　　However, Church ruled out the possibility of bringing the mammoths back to life via cloning from frozen remains. He said he “preferred to focus on rebuilding the full mammoth genome by analyzing DNA from preserved remains and putting it into the cells of its closest living relative-the Asian elephant”, reported The Telegraph. Church argued that the return of the woolly mammoths-or rather, the return of something very similar-could help bring back fragile(脆弱的) ecosystems. However, some scientists believe that bringing back the mammoth would be unethical.

“What’s the mess? We can be as irresponsible with the environment as we want, then we’ll just clone things back?” Alex Greenwood, an expert on ancient DNA, told the Sunday Times, “Money would be better spent focusing on conserving what we do have than spending it on an animal that has been extinct for thousands of years.”

　　32. What can we infer from the passage?

学习啦在线学习网 　　A. Scientific studies on reviving extinct species didn’t begin until May 2013.

　　B. The technology to revive extinct species is already mature.

　　C. Church and his colleagues tried to reproduce mammoth DNA.

学习啦在线学习网 　　D. Church managed to list all the genes separating mammoths from elephants.

　　33. According to the text, we could conclude that Church .

　　A. had serious doubts about discovering the full mammoth genome.

学习啦在线学习网 　　B. aimed to clone the extinct mammoth from frozen remains on his own.

　　C. could help save fragile ecosystem if bringing back something similar to the mammoth.

　　D. believe their successful experiment could change the Asian elephant into mammoths.

学习啦在线学习网 　　34. Alex Greenwood believes that .

学习啦在线学习网 　　A. it is unnecessary to worry about the extinction of Asian elephants at present.

学习啦在线学习网 　　B. it’s necessary to bring back species beneficial to humans from extinction.

　　C. the return of the woolly mammoth would help to balance ecosystems.

学习啦在线学习网 　　D. it’s more important to protect present species than to bring back extinct ones.

学习啦在线学习网 　　35. What’s the best title of the passage?

学习啦在线学习网 　　A. Mammoths could return?

　　B. Mammoths’ return helps ecosystems.

学习啦在线学习网 　　C. Mammoths have been extinct for ages.

　　D. Mammoths’ clone from frozen remains.