water.
In the first part of the experiment in Passage B, the air is dry, not wet. It shows that iron doesn't 7.
when the air is dry. In the second part of the experiment, you must 8.
the water to make sure there is no air in it. You 9.
some oil to the water because this 10.
air out of it. It shows that iron doesn't rust in water that has no air in it.
【答案】 1.reaction 2.substances 3.put in order 4.at the top 5.at the bottom 6.react with 7.rust 8.boil
9.add 10.keeps
Ⅰ.词义搭配
1.expandA.a particular time or state that something reaches as it grows or develops
2.contract B.something you hope to achieve by doing something
3.substance
C.the tools, machines, clothes etc.that you need to do a particular job or activity
4.mixture D.(cause sth.to) become greater in size, number or importance
5.stage
E.something you decide after considering all the information you have
6.conclusion
F.average, common, or usual, not different or special
7.aim
G.a particular type of solid, liquid, or gas
8.equipment
H.if a chemical substance reacts, it changes when it is mixed with another chemical substance
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