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【单选题】
为便于追查输血不良反应的原因，血液发出后受血者和供血者的血样保存于2～6℃冰箱的时间至少A.
1天
B.
3天
C.
5天
D.
7天
E.
9天
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反馈参考答案：
举一反三
【单选题】The unemployment rate in this city ____ from 7％ to 6％ in the past two years.
A.
has fallen
B.
had fallen
C.
is falling
D.
was falling
【单选题】The city ________ 6 billion yuan to preserve the character of the old town, mainly to divert water from the Taihu Lake and the Yangtze River to supply the waterway systems of the old town.
A.
invested
B.
proved
C.
invaded
D.
invented
【简答题】按照发票用途的不同，可分为（ ）。
【单选题】The underlined word“it”(1ine 3，para．6)refers to＿＿＿．
A.
the city government
B.
the city committee for the arts
C.
Sutton Theatre Company
D.
Performing Arts Society
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