7. 已知sin 2α = ,则 sinα + cosα的值为( )
A. - B. C .- D .
6.函数的单调递增区间是 ( )
A. B.(0,3) C.(1,4) D.
5. 已知函数y=sin(x+)(>0, -<)的图像如图所示,则 =( )
A. B. C. D.
4. 已知等差数列的值为 ( )
A.30 B.12 C.36 D.64
3.下列四组函数中,表示同一函数的是( )
A B.
C. D.
2. 等于
A.i B.-i C.-1 D.1
1. 满足,且的集合的个数( )
A.1 B.2 C.3 D.4
15. He kept sending her presents in an attempt to win her _______.
A. respect B. favor C. admiration D. pleasure
14. I shouldn’t have accepted the man’s present, but I found it difficult to turn down his ______.
A. offer B. request C. suggestion D. plan
13. -Who did you stay with yesterday? I couldn’t find you anywhere.
- ___________.
A. Mr. Green’s B.The Greens C. Greens D. The Mr. Green’s