问题
选择题
下列有关化学用语使用正确的是[ ]
A．CO2的比例模型：
B．F-离子结构示意图：
C．氢化铵（NH4H）电子式：
D．HCN分子的结构式：H－C≡N
答案
答案：D
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下列有关化学用语使用正确的是[ ]
A．CO2的比例模型：
B．F-离子结构示意图：
C．氢化铵（NH4H）电子式：
D．HCN分子的结构式：H－C≡N
答案：D
Li Yang’s brother is a 1 . He works in a bank. One day, he was driving two bags full of 2 important. But he and his truck were lost. The police looked for three hours, then they found Li Yang’s 3 and his truck. His 4 were tied（捆绑）behind his back. The bad man put something round his 5 so that he could not shout. The police climbed into the back of the truck and freed Li Yang’s brother. They asked him what happened.“They asked me to stop soon 6 I left the bank,” his brother said. “Six men stopped me and made me 7 to the river. “If you shout,” one of them said, “we will cut you into pieces.” When I got to the river, they tied 8 up. Then they threw me to the back of the truck. I sat on one of the 9 quietly. They didn’t see the bag, and took the other one.” “How much money was there in the bag? ”a policeman asked. “There was not any 10 in it at all,” Li Yang′s brother laughed. “Only some letters, the money is in this one. I was sitting on it. What a brave and clever man he is!
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