A、0
B、1
C、-1
D、 不存在
答案:C
A. thankful
B. more thankful
C. most thankful
D. less thankful
A. π/4
B. π/2
C. π
D. 2π
A. can
B. may
C. need
D. must
A. without
B. under
C. with
D. for
A. Anything
B. Something
C. Nothing
D. Other things
A. voice
B. taste
C. shape
D. sound
A. looks
B. smells
C. sounds
D. tastes
A. open
B. close
C. opened
D. closed
A. 4
B. 3
C. 2
D. 1
A. in trouble
B. in style
C. in order
D. /