问题 填空题

圆上有6个点,任意两点用线段相连,则这些线段在圆内最多有______个交点.

答案

每4个圆周上点就可以有一个内部交点,所以当这些交点不重合的时候,圆内交点最多,

所以,本题等价于将6个点4个分组共有多少组,

显然应该是:

6×5×4×3
4×3×2×1
=15(个),

故答案为:15.

单项选择题 A型题
阅读理解

阅读理解

     In order to know a foreign language thoroughly(完全地), four things are necessary. First, we must

understand the language when we hear it spoken. Secondly, we must be able to speak it ourselves,

correctly with confidence(自信) and without hesitation(犹豫). Thirdly, we must be able to write it. We

must be able to make sentences that are correct in grammar.

     There is no short way to succeed in language learning. A good memory(记忆) is a great help, but it is

not enough only to memorize the rules from a grammar book. It is no much use learning by heart long lists(一览表) of words and their meanings, studying the dictionary and so on. We must learn by using the

language. If we are pleased with a few rules we have memorized, we are not really learning the language. We must "Learn through use". Practice is important. We must practise speaking and writing the language

whenever(无论何时) we can.

1. The most important things to learn a foreign language are_______.

A. understanding and speaking    

B. hearing, speaking, reading and writing

C. writing and understanding      

D. memorizing and listening

2. Someone hears and writes English very well, but he speaks it very badly. This is because____.

A. he doesn't understand the language when he hears it spoken

B. he doesn't have a good memory

C. he always remember lists of words and their meanings

D. he often hesitates to practice speaking it

3. One can never learn a foreign language well only by_______.

A. much practice             

B. studying the dictionary

C. learning through use

D. using the language

4. Which of the following is the most important in learning a foreign language?

A. A good memory.

B. Speaking        

C. Practice      

D. Writing.

5."Learn through use" means_______.

A. we use a language in order to learn it

B. we learn a foreign language in order to use it

C. we can learn a language well while we are using it

D. both B and C