男性两侧输精管结扎后,生理表现为[ ]
A.不能产生精子和分泌雄性激素
B.不能产生精子,能分泌雄性激素
C.能产生精子,男性性征改变
D.能产生精子,男性性征不改变
答案:D
如果一个整数减去-8是正数,减去-6是负数,则这个整数减去7的相反数等于 [ ]
A.0
B.14
C.-14
D.21
He admitted ___away the purse____to him.
A.to have taken: not belonged
B.taking; not belonged
C.taking; not belonging
D.to have taken: not belonging