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【单选题】
歧视性政府采购是指政府:A.
优先购买发达国家产品
B.
优先购买国外优质产品
C.
优先购买本国产品
D.
优先采购名牌产品
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举一反三
【简答题】Spell the past tense of the word "magic".
【简答题】Spell the past tense of the word "notice".
【单选题】No light ____ in the house for the past two evenings, one of the neighbors broke in and found the old lady in her chair.
A.
being visible
B.
to be visible
C.
has been visible
D.
having been visible
【单选题】The reason why there still needs improvement in the past view of Archaeopteryx is that
A.
fossils of those earliest birds haven't been discovered yet.
B.
the wishbone they studied is just so-called wishbone.
C.
there was no study of the role of its brain and some faculties in flight.
D.
Archaeopteryx is regarded as the earliest known bird.
【单选题】关于青霉素快速过敏试验法的描述，下列正确的一项是
A.
用0.9%氯化钠溶液配制试验液
B.
用75%的乙醇擦拭病人前臂掌侧皮肤
C.
青霉素试验液浓度为每1ml含青霉素500U
D.
开启电源开关，待电流稳定后开动计时开关5分钟
E.
试验毕，15～20分钟后观察试验结果
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