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化学物的致癌机制复杂，影响因素很多，对动物致癌的化合物不一定也对人类致癌。

要确定化学物对人类致癌性最有价值的是（）。

A.原癌基因激活试验

B.肿瘤抑制基因失活试验

C.外周血淋巴细胞染色体畸变试验

D.姐妹染色体交换试验（SCE.

E.肿瘤流行病学调查

答案

参考答案：E

阅读理解

Alice is a busy girl. Now she is relaxing .She is watching the Friday night weather report on television .She likes sunny weather just like today. She wants to know what the weather will be like tomorrow.

She’s going to have a picnic(郊游) .This is what the reporter is saying, “Good evening and welcome to evening weather report. We are going to have a very different weather across the country…”Alice is sad .She doesn’t like raining.

小题1:What’s Alice doing?  ______.

A．She’s watching TV

B．She’s relaxing

C．She’s busy

D．She’s sad小题2:What day is it tomorrow?  _______.

A．Friday

B．Saturday

C．Sunday

D．Monday小题3:What’s the weather like on Saturday?  _______.

A．Sunny and hot

B．warm and cold

C．Sunny in the morning

D．Rainy in the morning小题4:What is she going to do ?  ______.

A．She’s going to work

B．She’s going to have a picnic

C．She’s going to watch TV

D．She’s going to wash clothes小题5:Which one is right?  ______.

A．Alice is busy now

B．Alice doesn’t like raining

C．Alice is going to the park

D．Alice is happy now
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单项选择题

操舵人员通常利用（）作为稳向航行的一种可靠依据，检验是否偏航。

A.转向点

B.吊向点

C.过河点

D.航标
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