我国气候基本特征是[ ]
A．气候复杂多样，海洋性显著
B．气候复杂多样，季风气候显著
C．气候复杂多样，灾害显著
D．气候复杂多样，干旱性显著
答案：B
凝血酶原酶指的是（）.
A.Ⅻa-Ⅺa-PF3-Ca2+
B.TF-Ⅶa-Ca2+
C.Ⅴa-Ⅷa-PF3-Ca2+
D.Ⅹa-Ⅴa-PF3-Ca2+
E.Ⅸa-Ⅷa-PF3-Ca2+
She worked so quietly __________ no one knew she was there.[ ]
A. which
B. after
C. as
D. that
