题目内容

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

A.heating

B.being heated

C.heated

D.to heat

解析:

前面部分可视为When it(water) is heated to...，意思是“被加热到……”。

练习册系列答案

相关题目

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