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  3. A single rocket is not powerful enough to send a spaceship into space. This i

A single rocket is not powerful enough to send a spaceship into space. This i

游客2024-07-24  66
问题    A single rocket is not powerful enough to send a spaceship into space. This is because all the fuel a single rocket can. carry is not enough to give the necessary amount of power. To get enough fuel and power to last till the spaceship gets out of the Earth’s gravitation force (引力) , a number of rockets are needed. These rockets are connected one on top of the other, looking much like a large tower. Together they form a multi-stage rocket. The spaceship lies at the top of the multi-stage rocket.
   The first stage of a multi-stage rocket is called the booster. It is the biggest as it has to lift the whole thing from the ground. The booster helps to lift the rockets into the sky. When the fuel of the booster is used up, it separates from the rest of the rocket and drops to the Earth. When this happens, the second stage fires and pushes the rocket further towards space. After some time the second stage, having used up its fuel, just like the booster, separates and falls off. The spaceship is then left to travel to its destination on its own power.
选项 A、The booster
B、The second rocket
C、The third rocket
D、The multi-stage rocket
答案 D
解析 此题题干问“什么可以把太空船送到太空”。在原文第1段第3、第4和第5句话可以得出多级火箭帮助把太空船送到太空。因此选项D. The multi-stage rocket是正确答案。
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