真核生物中,mRNA由下面哪种酶转录()。
A.RNA聚合酶I
B.RNA聚合酶II
C.RNA聚合酶III
D.RNA酶
参考答案:B
When you begin a sentence with "don't tell anyone but... " there's a 90% chance that the person,
_____ someone.[ ]
A. tells
B. would tell
C. will tell
D. has told
临床上输卵管妊娠的复发率大概为 ()
A.5%
B.6%
C.8%
D.9%
E.10%