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
