题目内容：

 

回答问题（共3小题；每小题2分，满分6分）

阅读下面短文，根据第57至第60小题的具体要求，尽可能简要回答问题，并将答案转写到答题卡上。

Before a new type of plane goes into service, every part of it is tested again and again. But there are two tests that are more important than all the others.

The first is called the “tank test”. A modern plane must fly very high in the sky. Air must be pumped into the plane so that the passengers can breathe. To test whether the plane is strong enough, it is put into a huge tank of water. If the plane can accept the pressure in the water tank, it proves that it is strong enough. If the plane is not strong enough, there will be an explosion（爆炸）in the water. Engineers can discover which part of the plane has broken. Then that part should be made stronger.

The most dangerous test happens when the new plane is going through flight tests in the air. In the test, the pilot must find out exactly what happens when the engines are all shut off at once. The plane begins to fall like a stone. It is the pilot’s job to find out how he can get control of the plane again.

These two tests are examples of how planes are made before they ever carry passengers.

58. How many kinds of tests of a new-type plane are introduced in the text? (回答词数不超过2个)

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59. Where is the “tank test” carried out? (回答词数不超过7个)

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60. When does the most dangerous new plane test happen? (回答词数不超过13个)

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