问题 单项选择题

一场超级篮球赛即将进入比赛最后阶段,4支球队将为最后名次展开激烈拼杀。行家们根据各球队以往战绩及现场表现,对比赛结果做出了3项预测:
(1)天空队、大地队都不能进入前两名;
(2)如果江河队获得第一,那么海洋队将获得第二;
(3)如果天空队获得第三,那么大地队将进入前两名。
比赛结束后,发现行家们预测只有一项是正确的。
据此,可以推出( )。

A.江河队获得第一
B.海洋队获得第二
C.天空队获得第三
D.大地队获得第四

答案

参考答案:A

解析: 题干包括一个联言命题和两个充分条件假言命题。联言命题只在两个选言肢均为真的情况下才为真,充分条件假言命题只在前件真后件假的情况下才为假。
由于预测只有一项正确,假设(1)为真,天空队、大地队不是前两名,则为第三、第四名;(2)就为假,江河队第一,海洋队不是第二,那么海洋队为第三或第四名,有矛盾,假设错误,故(1)为假。假设(2)为真,那么(3)为假,则天空队第三,大地队没有进入前两名,大地队就是第四,那么推出(1)也为真,假设错误,故(2)为假。假设(3)为真,则(2)为假,即江河队第一,海洋队不是第二,海洋队必然第三或第四,(1)也为假,其余顺序不能完全确定,故答案选A。

阅读理解

Everyone has got two personalities(性格)-the one that is shown to the world and the other that is secret and real. You don’t show your secret personality when you’re awake because you can control your behavior, but when you’re asleep, your sleeping position shows the real you. In a normal night, of course, people frequently change their positions. The important position is the one that you go to sleep in.

If you go to sleep on your back, you’re a very open person. You normally trust people and you are easily influenced by fashion or new ideas. You don’t like to displease people. So you never express your real feelings. You’re quite shy and you aren’t quite sure of yourself.

If you sleep on your stomach, you are a rather secretive person. You worry a lot and you’re always easily upset. You always stick to your own opinions or judgment, but you don’t raise your hopes too much. You usually live for today not tomorrow. This means that you enjoy having a good time.

If you sleep curled up(蜷缩), you are probably a very nervous person. You have a low opinion of yourself and so you’re often defensive. You’re shy and you don’t normally like meeting people. You prefer to be on your own. You’re easily hurt.

If you sleep on your side, you have usually got a well—balanced(平衡的) personality. You know your strengths and weakness. You’re usually careful. You believe in yourself. You sometimes feel anxious, but you don’t often get sad. You always say what you think even if it makes people rather angry

小题1:You may find the passage in       .

A. a science magazine            B A guide book

C. a sports newspaper            D. a story book

小题2:When does the sleeping position best show your secret personality?

A.In the daytime

B.At the beginning of sleep

C.At night

D.During the deep sleep小题3:Tina hardly tells her secrets to her friends. She probably goes to sleep       .

A.on curled up

B.on her stomach

C.on her back

D.on her side小题4:What does the word “defensive” mean in the passage?

A.易怒的

B.攻击性的

C.外向的

D.有戒心的小题5:What does the passage tell us?

Sleeping on your side is the best way of sleeping

Changing positions will cause sleeping problems.

Sleeping positions show people’s secret personalities.

Enough sleep makes people look better and healthier.

单项选择题