问题 单项选择题

以下是关于某中学甲班同学参加夏令营的三个断定:
(1)甲班有学生参加了夏令营。
(2)甲班所有学生都没有参加夏令营。
(3)甲班的蔡明没有参加夏令营。
如果这三个断定中只有一项为真,则以下哪项一定为真

A.甲班同学并非都参加了夏令营。
B.甲班同学并非都没有参加夏令营。
C.甲班参加夏令营的学生超过半数。
D.甲班仅蔡明没有参加夏令营。
E.甲班仅蔡明参加了夏令营。

答案

参考答案:B

解析: 由题干可知,(1)和(2)互相矛盾,必有一真一假。因为三个断定中只有一真,因而(3)为假。由(3)假可得:甲班的蔡明参加了夏令营。进一步地,可以推得:甲班同学并非都没有参加夏令营。因此,选项B一定为真。

阅读理解

阅读理解。

       Some friends come into our lives for just a short time. Others come and stay forever. Think about

   your closest friends. How long have you known each other? Some people say that their spouse

  (husband or wife) or family member is their best friend. Others say they have known their closest friends

  for many years. And some great friends haven't known each other all that long, but knew right away that

  there was a connection (联系) between them. Could it be that there is a twin spirit out there for each of

  us?

       What turns a stranger or acquaintance (熟人) into a friend? Do you know right away if you are going

  to like someone? Some people think that any stranger can become a friend if they spend enough time

  together. That may be true for some people. But one thing most of us agree on is that true friendships

  seem to happen when people have something in common. Perhaps we see a part of ourselves iii our

  friends; Maybe seeing the good in them helps us to see the good in us as well.

1. What's the main idea of the first paragraph?

A. Friendship lies only between friends or family members.

B. Friendship is a connection between friends and family members.

C. Friendship is one mind in two bodies.

D. Friendship between the closest friends lasts until they have a twin spirit.

2. What idea can we get from the second paragraph?

A. Most friends have similar likes and dislikes.

B. Your friend is the man who knows all about you,and still likes you.

C.It's easy to turn a stranger into a good friend.

D. True friendships mean to share everything with your friends.

单项选择题 A3/A4型题