3.5÷58×45%,
=5.6×0.45,
=2.52.
答:它的45%是2.52.
—How much_________ the blue pants?
—_________ $20. [ ]
A. are, They're
B. are, These are
C. is. It's
D. is, Its
染色体检查时常用的有丝分裂原是()
A.ConA
B.美洲商陆A
C.PHA
D.秋水仙素
E.秋水仙胺