A、 π
B、 2π
C、 π/2
D、 π/4
答案:A
A、 π
B、 2π
C、 π/2
D、 π/4
答案:A
A. hers
B. she
C. her
D. herself
A. repeat
B. forget
C. receive
D. join
A. damaged
B. were damaged
C. were damaging
D. are damaged
A. deal with
B. keep up with
C. agree with
D. come up with
A. 关于原点对称
B. 关于x=1对称
C. 关于y轴对称
D. 关于x轴对称
A. How far
B. How much
C. How often
D. How soon
A. was traveling
B. is traveling
C. traveled
D. travels
A. as tall
B. taller
C. tall
D. the tallest
A. always
B. seldom
C. often
D. usually
A. If
B. Since
C. Although
D. Because