—The trousers are $30.
—I’ll take______.[ ]
A. it
B. he
C. they
D. them
答案:D
亲代的遗传物质传给子代是通过____遗传给后代的 [ ]
A.体细胞
B.生殖细胞
C.受精卵
D.胚胎
哪种情况最初引起指示空速和俯仰增加下沉率减小?