The Earth is getting hotter .And the（1）seems to be our machi

The Earth is getting hotter .And the（1）seems to be our machines .Many machines use oil or coal ,which （2）a gas called CO2
(3) happens when you go into a greenhouse on a sunny day It’s hot ,isn’t it That’s（4）the greenhouse keeps the heat that comes from the sun .CO2 does the same thing .It keeps the Earth warm .Without it ,we would freeze .However ,too much of it is bad for the Earth .
（5）More and more CO2 being produced ,the Earth is getting warmer and warmer ,and the ice is melting （融化）at the North and South Pole .The （6）that mels will fill up the oceans and make them overflow into the land .Some of the best land for growing food is usually （7）.That means they will be flooded first .Some of the biggest cities ,like London ,will be （8）,too .A lot of people will go hungry and many more will have nowhere to live.
People study the Earth’s climate and have（9）that as the Earth warms up ,the weather is going to change a lot .In fact ,it is happening now .Hurricanes ,（10）,are becoming more powerful .The rain is heavier in some parts of the world and there are more floods .
（）1.A question .B.trouble C.reason
()2.A.send B.produces C.gives
()3.A.What B.How C.Who
()4.A.however B.because C.whether
()5.A.By B.In C.With
（）6.A.ice B.wind C.rain
()7.A.high B.low C.tall
()8.A.covered B.escaped C.flooded
()9.A.seen B.heard C.found
()10.A.for example B.in fact C.instead of

c
b
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a