包合物包括（）
A.主分子
B.客分子
C.空穴结构
D.分子聚集体
E.聚合物
参考答案：A, B, C
急性病毒性肝炎病程一般为
A．＜2个月
B．2～4个月
C．＜5个月
D．＜半年
E．＞半年
On the whole, this passage is positioned to dwell on ______.
A．the overall picture of the HDTV sector
B．how the giant TV makers should offer better products
C．a lament over consumers' inability to use a high-end TV set
D．a criticism of the TV makers for doing nothing about a big problem
