问题 选择题

一种新的酒后驾车人员体内酒精含量的检测装置如右图所示,下列说法不正确的是

A.该检测装置实现了将化学能转化了电能,且单位时间内通过电量越大,酒精含量越高

B.电极A 的反应: H2O + C2H5OH-4e- = CH3COOH + 4H+

C.电极B 是正极,且反应后该电极区pH 值减小

D.电池总反应:O2 + C2H5OH = CH3COOH + H2O

答案

答案:C

题目分析:C项:电极B是正极,反应要消耗H+,pH值增大,故错。故选C。

点评:本题考查的是原电池和电极反应式的书写的相关知识,题目难度不大,清楚原电池的工作原理是解题的关键。

阅读理解

In a surprising result, the No. 69 Middle School girls’ football team yesterday beat their school’s boys’ team. The boys’ team often helped the girls with their training (训练). They had never lost to the girls before, but this time the girls beat them 4 — 3.

After the game, Wu Nai, head of the boys’ team, was very unhappy. "We all thought this would be an easy game," he said. "We never thought a team of girls could beat us. This is the saddest day of my life. "

But Mr Hu, the boys’ PE teacher, said he thought the girls should win. "The boys were too confident (自信)," he said. "I told them before the match that they needed to play well. They all thought that girls’ football was a joke. Now they know better. They didn’t play care­fully, and they lost."

The match had started well for the boys. After 30 minutes, they were winning 2 - 0. Their best player, Lu Ming, scored in the thirtieth minute. Earlier, the mid-field player, Ma Zhengquan, had scored the first goal in only the second minute of the match.

After the first half hour, the boys seemed to become too confident. At first, the girls had felt a bit nervous (紧张), but then they became more and more confident. Just before half time, Li Xiaolin made the score 2 - 1.

In the second half, the boys were the first to score. It was from Lu Ming. After that the boys became lazy, but the girls kept on working hard. Hao Meiling scored in the 68th minute, to make the score 3 — 2. Then Li Xiaolin scored twice in the last six minutes to make the last score 4-3. It was a surprising finish.

The girls’ PE teacher, Miss Wang, was very pleased with their work. "They were great!" She said. "I told them they could win. I told them that the most important thing was teamwork. The boys’ team had some good players, but my girls were a better team!"

小题1:   Who scored the first goal in the match?

A.Lu Ming.

B.Ma Zhengquan.

C.Li Xiaolin.

D.Hao Meiling.小题2:  How many goals did Li Xiaolin score?

A.One.

B.Two.

C.Three.

D. Four.小题3:   Why could the girls’ team beat the boys’ in the football match?

A. Because the boys’ team helped the girls with their training.

B. Because the boys had never lost to the girls before.

C. Because the boys’ team won the first half.

D. Because the girls played together better and worked harder.小题4:   Which of the following is right?

A. The girls made only one goal in the first half.

B. The girls even made 3 more goals than the boys in the second half.

C. Many people thought the girls could beat the boys before the match.

D. The girls’ team had some better players than the boys’.小题5:   Choose the right order according to the passage.

a.   The girls’ PE teacher told them that they could win.

b.   Wu Nai, head of the boys’ team was very unhappy.

c.   The match started well for the boys.

d.   The girls kicked the second goal in the match.

A. a-b-c-d

B. b-c-d-a

C. d-c-a-b

D. a-c-d-b

单项选择题