属环状病毒属成员，主要感染绵羊的是（）
A.小反刍兽疫病毒
B.禽白血病
C.马传染性贫血
D.蓝舌病毒
E.山羊关节炎／脑脊髓炎病毒
参考答案：D
日常生活中喝牛奶能补钙，这里的“钙”指的是（ ）
A．元素
B．原子
C．分子
D．离子
— Jack! You are wet through. Didn't you listen to the weather report this morning?
— No, I didn't. I was in a hurry. Besides, it ______ when I left. [ ]
A．was raining
B．wasn't raining
C．would rain
D．Hadn't rained
