She'll go to Marcia's home _____ Saturday morning.[ ]
A. on
B. in
C. at
D. for
答案:A
吞噬细胞和中性粒细胞缺陷病占整个原发性免疫缺陷病的()
A.20%
B.18%
C.15%
D.10%
E.5%
分针从12走到3,经过了3分钟.______.(判断对错)