正确答案: B

抑制艾滋病病毒RNA基因的反转录

题目：治疗艾滋病(其遗传物质为RN

解析：B

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举一反三的答案和解析：

[单选题]71--75There were smiling children all the way. Charily they knew at what time the train passed their homes and they made it their business to stand along the railway, wave to complete strangers and cheer them up as they rushed towards Penang. Often whole families stood outside their homes and waved and smiled as if those on the trains were their favorite relatives. This is the simple village people of Malaysia. I was moved.

dull

解析：71.选D。根据第二段，作者是第一次坐长途火车，带了很多杂志看，可以看出作者一开始认为坐火车是dull（乏味的）。

[单选题]裸子植物无柱头、花柱，花粉不必萌发即可抵达胚珠；所以不形成花粉管。 ( )

错误

解析：解析：裸子植物虽然无柱头、花柱，但是其花粉粒到达珠孔后，形成花粉管。

[单选题]从国家结构形式上看，与单一制国家相比①美国的主权不太充分

②④

[单选题]which of the following would be the best title for the passage ？

A Unique Attraction for wildlife Lovers

[单选题]听第8段材料，回答第10至12题。第10题：How long has the man been in London?

A few years.

[单选题]

doubted