44.How do we prove that the drugs have wiped out the remaining viruses？
A. By using up all the drugs at once
B. By waiting for the virus todie slowly
C.By analyzing the treatment record thoroughly
D.By stopping the drugs andsee if the virus comes back
45.Other scientists are looking at experiments that are similar in that they are
A. the ways the patients aretreated
B. the size of the experiment
C. the cost of the experiment
D. the time the experiment takes
词汇：
1.crisp凉爽、清新= freshen
2.update使更新、现代化= modernize
3.wipe out= destroyed 摧毁
4.take in= digest消化
5.contempt=hate 讨厌或轻视
6.tag=labels标签
7.steep=cheap
I think ￡7 for a drink is a bit steep，don‘t you？
A. tight B.low C.cheap D. high
8.puzzle=confuse使困惑
9. chant=repeat 重复说
10.utterly=completely完全地
11.inspire=encourage鼓励
12.severe=serious 严重
13.layout=arrangement
14. assemble=gather
15.hollow=empty