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【简答题】
黄酮类化合物因多具酚羟基，可溶于（）水，加（）后又可沉淀析出。利用游离黄酮混合物的酸性强弱不同，可用（）法分离，其中7-或4′-OH黄酮可用（）溶液萃取，5-OH黄酮可用（）溶液萃取，萃取液分别酸化而分离。
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【简答题】one hundred and ninety-four dollars
【单选题】I cannot afford the color TV set. To me, four hundred dollars ______ a lot of money.
A.
is
B.
are
C.
was
D.
were
【单选题】听力原文：M: How much money was stolen? W: Henry said that there were four hundred dollars in his pocket here. But I don't believe him. He is making a false claim so as to get more money from the insurance...
A.
400.
B.
Less than $ 400.
C.
Around $ 400.
D.
More than $ 40
【简答题】A．A little less than six hundred billion dollars. B．Six hundred billion dollars. C．More than six hundred billion dollars. D．About six hundred billion dollars.
【单选题】Four hundred dollars for a pair of shoes? You _____ be joking! [ ]
A.
may
B.
can
C.
need
D.
must
【单选题】There are __________ in our grade. [ ]
A.
four hundreds students
B.
four hundred student
C.
four hundred students
D.
four hundreds student
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