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【单选题】
美国的证券市场是从买卖（）开始的。A.
股票
B.
基金
C.
政府债券
D.
企业债券
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【单选题】听力原文：The birthplace was to open at 10 a. m. It was 9: 30 and already the pilgrims had formed a queue. I asked a lady from Ohio why she had come. 'For Shakespeare, 'she said. 'Isn't that why you came?'...
A.
U. S.A.
B.
Europe.
C.
Ohio.
D.
His hometown.
【简答题】计算机网络的安全威胁有哪些?(答案用分号隔开)
【简答题】计算机网络的安全威胁有哪些？
【简答题】嘌呤核苷酸从头合成的原料有磷酸核糖、氨基酸、()和CO2等简单物质。
【简答题】嘌呤核苷酸从头合成的原料有( )、 ( )、( )及( )等,合成的限速酶是( ),第一步合成的是( ),重要的中间产物是( ),后者与Asp作用生成( ) ,另外还可脱氢并与Gln作用生成( )。
【单选题】Man: The train was supposed to arrive at 9 oclock. Woman: Nine oclock! But its already 9: 30. Question: What does the woman mean?
A.
The train is always late.
B.
She's sorry it's already 9: 30.
C.
The train is arriving at 9: 30.
D.
The train is already late.
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