引起咯血最常见的支气管.肺部疾病是()。
A.肺梗死
B.肺寄生虫病
C.支气管扩张
D.良性支气管肿瘤
E.支气管非特异性炎症
参考答案:C
25. The farmers once used wood to build a house ______ to store grains all the year round.
A.how
B.what
C.in which
D.in where