单项选择题

3.决定病毒具有感染性的是（）。
A、衣壳
B、囊膜
C、核酸
D、纤突

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单项选择题

当时，是无穷小量。（） A. 对 B. 错

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Which of the following is the most objective and concise?

A．If you can control the trains this way, they will be able to run more safely and quickly.
B．The use of this method of control unquestionably leads to safer and faster train running.
C．We can use this method to control the trains to make them run more safely and quickly.
D．It is undboubted that trains can run more safely and quickly if they are controlled in this way.