6、一個盒子里裝有相同大小的紅球、白球共個,其中白球
個,從中任取
個,則概率為
的事件是B
A.沒有白球 B.至少有一個白球 C.至少有一個紅球 D.至多有一個白球
5、設(shè)有直線m、n和平面、
。下列四個命題中,正確的是 D
A.若m∥,n∥
,則m∥n
B.若m
,n
,m∥
,n∥
,則
∥
C.若,m
,則m
D.若
,m
,m
,則m∥
4、的展開式中x的系數(shù)是 A A.-4 B.-3 C.3 D.4
3、已知平面
,
為垂足,
為斜線
在平面
內(nèi)的射影,
,
,
,則
和平面
所成的角為C A.
B.
C.
D.
2、從甲、乙等名同學中挑選
名參加某項公益活動,要求甲、乙中至少有
人參加,則不同的挑選方法共有C A.140種 B.112種 C.168種 D.70種
1、已知直線、
和平面
,則
的一個必要不充分的條件是 D
A. B.
C.
D.
、
與
成等角
25.(09江蘇) Nine in ten parents said there were significant differences in their approach to educating their children compared with __ of their parents.
A. those B. one C. both D. that
[答案]D
22.(09重慶) Over the past 20 years, the Internet helped change our world in way or another for the better.
A. any B. one C. every D. either
[答案]B
23.(09全國2卷) Charles was alone at home, with looking after him.
A. someone B. anyone C. not one D. no one
[答案]D
(09全國2 )24。The CDs are on sale! Buy one and you get completely free.
A. other B. others C. one D. ones
[答案]C
7.(09浙江)-I’ve read another book this week.
-Well, maybe _____ is not how much you read but what you read that counts.
A. this B. that C. there D. it
[答案]D
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