将尘土卷起的小旋风直径2米，高度10米，该现象可记录为尘卷风。_爱下问搜题

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问题判断题

将尘土卷起的小旋风直径2米，高度10米，该现象可记录为尘卷风。（）

答案

参考答案：对

完形填空

阅读下面的短文，掌握其大意，然后从下列各题所给的四个选项（A、B、C和D）中，选出最佳选项，并在答题纸上将该项涂黑。
Animals perform many useful and amusing jobs. Dogs are particularly valuable in guiding the blind,   31  property(财产), finding   32  people, and hunting criminals(犯人). Horses are used in guarding herds(牧群)，carrying men in lands where there are no roads, and helping farmers work their land. Pigeons(鸽子) 33  to carry messages. Wild animals from the jungles, forests and seas are very popular performers in   34  and motion pictures(电影). People realize that,   35  animals may not have the same intelligence(智慧) as   36 , they are clever enough to learn certain things.
The first thing a dog is taught is to 37 . It should not 38  too 1ong for him to learn commands. Simple orders, such as “sit, lie down，stay there, come here, ” can 39 be taught by a child.
Training a dog to be a watchdog often produces unexpected results. Some dogs quickly learn the difference   40  unwanted people and friends. This is   41  their masters welcome friends and invite them into their houses. However, some dogs will always   42  the postman who comes to   43  letters. One explanation for this behavior is that, although the postman comes to the house often, he never   44  the house. Therefore, the dog thinks the postman is someone   45  is not wanted, but keeps   46  back anyway.
Dogs are extremely useful as   47  for blind people. When a dog has been properly trained, he will lead his blind master in the right direction and keep him   48   danger. For example, seeing eye dogs   49  a busy road when cars are coming,   50  their masters command(命令) them to do so.

A．have long used	B．have long been used
C．have long been using	D．are long being used

D．circuses(马戏团)

B．human being

C．human beings

B．enters into

C．from coming

B．companions(同伴)

D．colleagues(同事)

A．learn never to across	B．learn to never cross
C．never learn to cross	D．learn never to cross

名词解释

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