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【单选题】
下列有关资源、能源叙述正确的是（ ）A.
空气是一种宝贵的资源．其中含量最多的是氧气
B.
太阳能、核能、氢能等属于新能源
C.
防止金属腐蚀是保护金属资源的唯一途径
D.
地球上可利用的淡水资源是取之不尽用之不竭的
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A.
Catalogues.
B.
Offers.
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Hardware.
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【单选题】—It rained cats and dogs this morning.I’m glad we took an umbrella. —Yeah，we would have got wet all over if we ________. (2013·重庆，29)
A.
hadn’t
B.
haven’t
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didn’t
D.
don’t
【单选题】--- It rained cats and dogs this morning. I’m glad we took an umbrella. --- Yeah, we would have got wet all over if we__________ .
A.
hadn’t
B.
haven't
C.
didn't
D.
don't
【单选题】---It rained cats and dogs this morning. I’m glad we took an umbrella. ---Yeah, we would have got wet all over if we ______.
A.
haven’t
B.
didn’t
C.
don’t
D.
hadn’t
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The speakers' friend
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The speakers' colleague
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The speakers' boss
D.
The speakers' student
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