A. How often B. How soon C. How long D. How far
17. I often spend much time ____my grandparents. A. in B. with C. in D. to
18. Forty percent of the students ____ girls . A. is B. are C. be D. am
19. Here ___ the results of the people's favorite supermarkets in the city.
A. have B. has C. is D. are
20.Tom's mother asks him _____ the room. A. clean B. cleans C. to clean D. to cleans
II.阅读理解。
(A) Jeff has an illness. He is recording (录音)his words so that his little son will be able to hear his voice in the future.
Jeff caught the illness in 2011. The doctor told him that he might have only two to five years to live and the illness would make him lose his voice, so he decided to record his voice for his 13-month-otd son, Bill.
His wife Gina said, "Jeff used to play and sing in a band, so his voice is important to him. I can't imagine not having his voice around. I would certainly like Bill to know his father's voice in this way."
Jeff and his wife hope that they can save his real voice for their little son. He now spends his weekends and evenings recording his voice. Their little son, Bill, will feel his parents' love when he grows up.
根据短文内容，判断下列句子正误。正确的用'A"表示，不正确的用"B"表示•
21. Jeff caught the illness in 2011.
22. Jcff's illness would make him become blind.
23. Jeff still plays and sings in a band now.
24. Jeff now spends his weekends and evenings recording his voice.
25. The parents hope that Bill will feel their love by hearing his father's voice.
B
DNA is the whole "map" of the human body. It is something that all humans have, and it tells the body what to do. DNA is the reason that we look like our parents, because we get some of their DNA to make our own.
People have been trying to understand the human body for a long time. In I860, Mr Mendel discovered why we look the same as other people in our family. It is because of small things called "genes"(基因) in our body. In 1953, two scientists, Watson and Crick, found out that those small parts are really messages. They're written