在──中可见颗粒细胞()
A.embryo
B.oocyte
C.blastomere
D.blastocyst
E.oocyte-cumuluscomplex
参考答案:E
若函数f(x)=-x2+2ax+1+a在区间[0,2]上最大值为5,求实数a的值.
Doctors are doing research to find out what happens physically when people _________ smoking.
A.quit
B.decline
C.depart
D.reserve