题目内容

When ________ to a high enough temperature water can change into vapour.

[　　]

A．heating

B．being heated

C．heated

D．having heated

答案：
解析：

题意“当被加热到一个足够高的温度时，水会变成气体。”这是一个省略了的状语从句，原句应是When water is heated to a high temperature, when引导的状语从句可省略主语和系动词be.

练习册系列答案

相关题目

When to a certain temperature,water can be turned into steam.

A.heating

B.being heated

C.heated

D.to heat

阅读下面短文, 掌握其大意, 然后从1-10各题所给的四个选项（A、B、C和D）中, 选出最佳选项, 并在答题卡上将该项涂黑。

If you have been dreaming of becoming an astronaut after you grow up, get start now! An astronaut needs a strong body and mind. Shenzhou VI astronauts are able to live upside-down. They do this not just during sleep, but also when eating and going to the toilet. Before they 1 the space, they had lots of practice. Each upside-down training time lasted 20 days.

Chinese astronauts aren’t just spaceship 2 but also machine repairers and scientists. They have to know every part of the spaceship and how it works. 3 something goes wrong, they’ve got to know 4 repair it. Also they do scientific experiments in space.

Shenzhou VI astronauts know how to live in 5 . They took a knife, a gun and some dye with them into space. If they land in forests, the knife and gun can 6 them from wild animals. If they 7 the sea, the dye can color the seawater around them yellow. This can drive 8 sea animals away.

Astronauts must have strong 9 . They can’t get a headache and be sick. With many things to 10 , they’ve got no time for sickness. Do you still have a long, long way to go?

A. went through B. flew into C. stayed at D. lived at

A. teachers B. coaches C. inventors D. drivers

A. If B. Unless C. So D. While

A. what to B. why to C. how to D. when to

A. the world B. the wild C. trouble D. space

A. prevent B. protest C. predict D. protect

A. fall into B. jump into C. fly over D. fly across

A. harmless B. lively C. dangerous D. selfish

A. bodies B. minds C. healthy D. encouragement

A. bring B. take care C. tend D. look forward to

What should you say when ___ to a stranger?

A．to introduce

B．introducing