急性病毒性肝炎病程一般为()
A.<5个月
B.2~4个月
C.<2个月
D.<半年
E.>半年
参考答案:B
-- How do you study a test?
-- I study listening to tapes.
A.to; by
B.by; with
C.for; by
D.with; for
什么是毛重?