单项选择题

We cannot help asking if sandstorm is a pure natural phenomenon over which we have no control．（）

A.我们禁不住要问沙尘暴是否是一种纯自然现象，而我们对它无法控制。
B. 如果沙尘暴是一种纯自然现象，我们不禁要问这个问题是否不能解决。
C. 我们不禁要问沙尘暴是否是一种人类无法控制的纯粹的自然现象。
D. 如果沙尘暴是一种纯自然现象，对于我们能否控制它我们也不知道。

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热门试题

单项选择题

The author implies that if human beings are kept awake for more than a week the result （）

A．is hard to imagine
B．will probably be a mental breakdown
C．is difficult to describe
D．will probably be dead

单项选择题

It can be inferred from the passage that a smart consumer should （）.

A．think carefully about the benefits described in the advertisements
B．guard against the deceiving nature of advertisements
C．be familiar with various advertising strategies
D．avoid buying products that have strong emotional appeal