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【多选题】
关于人类免疫缺陷病毒叙述正确的是:A.
为球形无包膜DNA病毒有逆转录酶
B.
通过粪－口途径传播
C.
传播方式有性接触、血液、母婴垂直传播
D.
病变以CD4+T细胞数目减少和功能异常为特征，细胞免疫功能缺陷
E.
能引起艾滋病，晚期合并机会感染，病死率高
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【单选题】If you meet a foreigner for the first time, it’s better for you to talk to him/her about .
A.
your company duty
B.
your poor health
C.
your courting a girl
D.
your complaint about a neighbor
【单选题】If it had been fine yesterday, we could have watched that air show. But it _____ all day. [ ]
A.
has rained
B.
rains
C.
rained
D.
had rained
【简答题】Yesterday_____a fine day, but now it rains heavily.
【简答题】Yesterday ________ a fine day, but today it rains heavily.
【简答题】Part VI. Complete the following sentences using would, should, could or might. 1. Yesterday, I ____ not find my wallet anywhere – but this morning I found it. 2. You____ take an umbrella in case it ra...
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