Don't __________ jeans to the party. [ ]
A. put on
B. wear
C. wearing
D. dress
答案:B
方程3x2=1的一次项系数为( )
A.3
B.1
C.-1
D.0
转座子能够直接或间接的促进基因组的
A.插入B.重复C.缺失D.重排E.易位