题目内容

【单选题】Question 6:What does the report say about the accident?

A truck plunged into a pool of liquid chocolate.
B. The heavy snow made driving very difficult.
C. The truck driver dozed off while driving.
D. A truck hit a barrier and overturned.

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【单选题】Question 7: What did the firefighters’ representative tell the local TV?

A. It was a long time before the cleanup was finished.
B. It was a hard task to remove the spilled substance.
C. It was fortunate that no passenger got injured.
D. It was difficult to contact the manufacturer.

改变直流电机两端的电压极性,电机会有什么现象?

A. 停止
B. 反转
C. 转速变快
D. 转速变慢

病毒的大小以__________计。病毒的化学组成有__________和________,个别大的病毒还有__________和________。

病毒的繁殖过程包括___________、____________、__________和________。

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