原句再现

1._________(2/3) of the earth ___water. 2.The earth is ____________(大49倍) than the moon. 3.Water _________________.(作为固体…而存在) 4.When you ____(加热), it _______(膨胀). 5.__________(多少) is 260408 ____(加) 5284700? 6.For example, steel is used in cars, and iron is used in __________________(电气设备). 7.It is important to know how they ________(和…反应) different substances,__________(例如), water and oxygen. 8.The reaction of metals with these… can be _____________(排序). 9.Here is a table ____ the metals that react most ________(在最顶部), and the metals … least _______________(在底部). 10._____ (放置)the tube for one week.

Two thirds

is

49 times larger

exists as solid…

heat

expands

How much

plus

electrical equipment

react with

for example

put in order

with

at the top

at the bottom

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