问题
单项选择题
瓦斯比空气轻约一半，在风速低的情况下，常积聚在巷道（）、冒落高顶和上山迎头等处。
A、下方
B、前方
C、顶部
D、尽头
答案
参考答案：C
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瓦斯比空气轻约一半，在风速低的情况下，常积聚在巷道（）、冒落高顶和上山迎头等处。
A、下方
B、前方
C、顶部
D、尽头
参考答案：C
The water tap was leaking again, and the noise was driving Tina crazy. Tina looked at her . It was nearly eleven o’clock. Her parents were . She climbed out of bed quietly in order not to wake them up. mother’s Mr. Fix-It Book was on the top shelf. Tina took the book. She read it quickly she found the page she was looking for, and then she began to read carefully. After a while, she stepped down quietly. Next, Tina opened a box in the kitchen and picked out the tools she needed and several small things. It was not for her to do the repair. She tried several times but couldn’t make it. Finally, the water tap was in pieces. One by one, she laid them out on the table . That way she would know how they went back. Tina worked late into the night. At one point, she thought she was done. Oops! A small piece that she had forgotten still lay on the . Slowly Tina took the water tap apartone more time. This time she made sure was left on the table. She the water tap on and then off. One…two…three…She waited a full minute. There was leak! Tina smiled and put the tools back into the box. Then she went back into bed. The next morning, Dad breakfast in the kitchen when Tina got up. “Did you notice anything, Dad?” she asked. He looked around and listened. “Hmm, something is missing… I can’t find out it is… Wait, it’s too in here!” “That’s right,” Tina said. “Something is missing. I the water tap. It doesn’t leak any more.” “That’s my girl. You’re the in my eyes,” Dad said. “It’s a good thing you are really like your mother..” 
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