A、 π/4
B、 π/2
C、 π
D、 2π
答案:C
A、 π/4
B、 π/2
C、 π
D、 2π
答案:C
A. not to be late
B. not being late
C. to be late
D. being late
A. good
B. better
C. best
D. the best
A. 1.5
B. 2
C. 2.5
D. 3
A. was traveling
B. is traveling
C. traveled
D. travels
A. careless
B. stupid
C. honest
D. humorous
A. 8
B. 9
C. 10
D. -10
A. without
B. under
C. with
D. for
A. can
B. must
C. may
D. need
A. relationship
B. agreement
C. environment
D. investment
A. π/4
B. π/2
C. π
D. 2π