问题
选择题
下表中
代表氢原子，
代表氧原子，
代表碳原子，则下列有关说法不正确的是（ ）
| 物质 | ① | ② | ③ | ④ |
| 分子模型示意图 |
|
|
|
|
A．物质①是单质
B．物质②的相对分子质量为18
C．物质③中氧元素质量分数最大
D．物质③，④虽然分子模型示意图不相同，但相对分子质量相同
答案
答案：C
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下表中
代表氢原子，
代表氧原子，
代表碳原子，则下列有关说法不正确的是（ ）
| 物质 | ① | ② | ③ | ④ |
| 分子模型示意图 |
|
|
|
|
A．物质①是单质
B．物质②的相对分子质量为18
C．物质③中氧元素质量分数最大
D．物质③，④虽然分子模型示意图不相同，但相对分子质量相同
答案：C
| 完形填空。 | ||||
| A mining (采矿的) engineer enjoyed flying very much. One day, he was flying his own plane over a lonely island when a 1_____ storm came, so he was 2____ to make a forced landing. The plane was in good 3_____ but his legs and shoulder got 4_____ hurt. After getting out of the plane with great 5_____, he found nothing but high green hills 6_____ the place. He lay there expecting to die. Soon, however, some men appeared from out of the forest. Though curious, they were not 7_____ of him. He was then gently 8______ to their village, where he was well treated. His 9_____ improved little by little and he became their 10_____. The place was 11_____ and pleasant and he was in 12_____ hurry to leave. Several months later, he learned some of their language and 13_____ them some of his own. One day, he discovered some sings of 14_____ mineral deposits (矿藏) in the soil.He decided to 15_____ to his country and set up a firm (公司) to mine the land. It was not long 16______ the peaceful land was taken over by strange men and machines.When there was 17_____ left to mine, the firm 18______ away. They had made a great deal of 19_____ for themselves, but the villagers' land was 20_____. Now it is impossible to grow crops there. | ||||
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