妊娠时血中绒毛膜促性腺激素水平达高峰是在()
A.妊娠后1周
B.受精后10天
C.妊娠8~10周
D.受精前1天
E.妊娠后20周
参考答案:C
Look at these ___________. Victor has ____________ aunt and two uncles.
A.photoes, a
B.photos, an
C.photos, the
D.photoes, an
活断层有哪几种类型?其特征有哪些?