A、 What
B、 What a
C、 What an
D、 How
答案:D
A、 What
B、 What a
C、 What an
D、 How
答案:D
A. relationship
B. agreement
C. environment
D. investment
A. 0
B. 1
C. -1
D. 不存在
A. in
B. to
C. with
D. at
A. What
B. What a
C. What an
D. How
A. cleaned
B. will clean
C. was cleaned
D. is cleaned
A. 0
B. 1
C. -1
D. 不存在
A. is directed
B. was directed
C. directed
D. directs
A. me
B. my
C. mine
D. myself
A. 2π
B. π
C. π/2
D. π/4
A. f:x→y=(1/2)x
B. f:x→y=(1/3)x
C. f:x→y=(1/4)x
D. f:x→y=(1/6)x