问题
单项选择题
由碳和氢两种元素组成的有机化合物，称为烃类化合物。烃类化合物是天然气的主要组分，大多数天然气中烃类组分含量约为（）。
A.60%～70%
B.60%～80%
C.60%～90%
D.70%～90%
答案
参考答案：C
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由碳和氢两种元素组成的有机化合物，称为烃类化合物。烃类化合物是天然气的主要组分，大多数天然气中烃类组分含量约为（）。
A.60%～70%
B.60%～80%
C.60%～90%
D.70%～90%
参考答案：C
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| Eighty-year-old retired tailor, James McKay, spent Saturday night in jail after 1 thirty-year-old Keith Smith over the head 2 his walking stick. McKay's wife, Laurence told us that while McKay is usually a 3 person, he had been 4 to this act of violence by getting wet just once too often. Smith lives above the McKays and it appears that not only is he a keen gardener, he is also a 5 collector. Unfortunately for him, the water he sent over his balcony every day ended up on the McKay's, or too often, on the McKays 6 . "For the last fortnight, since Smith moved into the flat above us, we have hardly dared to go to our 7 ," said Laurene. She added, that it wasn't so much the water falling onto their balcony from Smith watering his plant 8 bothered them, it was more the way he cleaned his fish tanks. "We'd be 9 there happily reading our newspapers, when 10 so much water would come from above that we'd be as wet as if we'd 11 with our clothes on! Neither could we get rid of the 12 of fish!" And on Saturday evening it was just too 13 . "It was James's birthday," explained Laurene, "and I'd made him a birthday cake. The candles were a great sight as you can imagine, but James didn't get to blow them out." 14 , Smith emptied one of his larger tanks over his balcony and both the McKays and the cake were wet 15 . Rarely had Laurene seen McKay move so fast. "I couldn't 16 him. He was up there in a flash. It was the fastest I@^@^@d seen him move since 1964." Smith is not going to take things further with the police. He has also promised to change his 17 from now on. And what of James McKay? 18 he left the police station, a large crowd of supporters sang him, "Happy Birthday 19 the most exciting birthday 20 !" said the cheerful old man. "The best since my adolescence I'd say!" | ||||
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