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问题 选择题

在密闭容器中M与Q反应生成R，其化学反应速率分别用表示。已知它们有以下关系，则此反应可表示为 [ ]

A．2M+3Q=2R

B．3M+Q=2R

C．M+3Q=2R

D．M+Q=R

答案

答案：A

听力题

Ann and Bella are good friends. They are in the same class and sit together. After school, they often go home together. However（尽管如此）, they have many different habits. On weekends, Ann likes to stay home, watch TV or sleep, but Bella often (1) ___________ (go) out to exercise. Ann eats candy every day, though she knows it’s (2) ___________ for her health. Bella likes candy, too, she only eats it (3) ___________ (one) a week, because she thinks eating less candy can help her to keep in good health.

Today is Ann’s birthday. Ann thinks Bella will buy a bag of (4) ___________ for her. But    (5) ___________ fact, Bella buys her a book. It’s about how to form good habits.
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单项选择题

下面的陈述中，哪一个是全称陈述？（）

A.在一九七五年一月一日半夜十二点，金星出现于天空中某个位置；

B.部分浸入水中的那根木棒，看起来是弯的；

C.石蕊试纸浸在液体中变成红色；

D.行星以椭圆轨道绕太阳运行。
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