黑素细胞占基底层细胞的比例约为()。
A.30%
B.40%
C.50%
D.90%
E.10%
参考答案:E
—How do you study for your test?
—I study by _____ to the radio. [ ]
A. listen
B. listening
C. to listen
D. listened
_________your success. [ ]
A. Congratulate
B. Congratulate on
C. Congratulates
D. Congratulations on