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【单选题】
Some of the exercises appear to be ____ ones that you have done, but after taking ___ second look, you will find that they are different. [ ]A.
不填; the
B.
the; a
C.
the; the
D.
the; 不填
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举一反三
【单选题】Tom was thinking about how to explain to the teacher why he was late for class, when a good idea _______him.
A.
happened
B.
brought
C.
occurred
D.
struck
【简答题】听录音，根据所听到的答语选择问句。 ( ) 1. A. When did you come to Canada? B. Where are you from? C. Who is he? ( ) 2. A. How are you? B. How old are you? C. How many people are there in your family? ( ) 3....
【简答题】制备乙酰水杨酸的方法是：在浓硫酸催化下，将水杨酸（邻羟基苯甲酸）与乙酸酐混合加热。反应毕，反应液冷却即析出产物。过滤，用水作溶剂重结晶得产品。问：产品中最有可能存在的杂质是什么？它是怎样带来的？如何检验其存在？
【单选题】How did you come to know where she is living ?
A.
Modal auxiliary
B.
primary auxiliary
C.
semi-auxiliary
D.
notional verb
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