已知平面向量a=(-2,1)与b=(λ,2)垂直,则λ=()。
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若0<lga<1gb<2,则()。
A. 1<b<a<100
B. 0<a<b<1
C. 1<a<b<100
D. 0<b<a<1
函数y = 6sinxcosx的最大值为()。
A. 1
B. 2
C. 6
D. 3
The film star walked to his car,__________by a crowd of fans.
A. to follow
B. following
C. followed
D. to be followed
--Would you help me with these books? --__________.
A. With pleasure
B. Never mind
C. It’s fine
Don’t worry