问题
单项选择题
若10把钥匙中只有2把能打开某锁，则从中任取2把能将该锁打开的概率为（）。
A.A
B.B
C.C
D.D
E.E
答案
参考答案：C
解析：
．
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若10把钥匙中只有2把能打开某锁，则从中任取2把能将该锁打开的概率为（）。
A.A
B.B
C.C
D.D
E.E
参考答案：C
解析：
．
| 完形填空。 | |||
| I am an English teacher. I come 1 Beijing. I am thirty. I 2 English at No. 1 primary school. I usually get up at six 3 the morning. And I go to work at 7:00 4 bike. I often help my mother 5 the housework on Sundays, Sometimes I go to the park with my friends. Daming and Li Lei are my students. They are 6 boys. They can 7 English well. They often 8 games with 9 after school. They like 10 in the river. We often swim in the river in summer. | |||
| ( )1. A. to ( )2. A. teach ( )3. A. of ( )4. A. take ( )5. A. With ( )6. A. all American ( )7. A. say ( )8. A. plays ( )9. A. me ( )10. A. swim | B. in B. teaching B. in B. buy B. for B. Americans B. talk B. play B. / B. swims | C. at C. teaches C. to C. on C. on C. all Chinese C. speak C. playing C. my C. swimming | D. from D. teacher D. on D. by. D. to D. Chinese D. tell D. to play D. mine D. to swim |