地球表面的三分之二是水。

2．倍数＋比较级＋than

The earth is forty-nine times larger(large) than the moon.地球比月球大49倍。

3．It be＋adj.＋to do

It is hard to think(think) of a world without metals.

很难想象一个没有金属的世界。

4．完全倒装

Here is(be) a table with the metals that react most at the top，and the metals that react least at the bottom.

这里有一张表格，反应最强烈的金属在上面，反应最弱的在下面。

Ⅰ.阅读Passage A，完成题目

1．This passage mainly talks about .

A．the kind of metal

B．what kind of metal reacts most

C．the reaction of metals with different substances

D．how metals react

答案　C

2．Which of the following metals reacts the most with water?

A．Copper. B．Iron.

C．Aluminium. D．Sodium.

答案　D

3．When heated in oxygen， will react partially.

A．zinc B．copper

C．potassium D．all metals

答案　B

4．According to the passage，it can be inferred that will have less use in making kitchen tools.

A．aluminium B．iron

C．steel D．copper

答案　A