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【简答题】
醛与酮的官能团是什么？
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举一反三
【单选题】When in his rebellious years, that is when he was sixteen or eighteen, Frank Anderson ______ going around with a strange set of people and staying out very late.
A.
took to
B.
took up
C.
took on
D.
took in
【单选题】Jack is _________years old. Today is his _________ birthday.
A.
sixteenth; sixteen
B.
sixteen; sixteen
C.
sixteen; sixteenth
D.
sixteenth; sixteenth
【简答题】A．Six weeks, B．Six months. C．Six years. D．Six years.
【单选题】The spacecraft will make a journey of over ______ years.
A.
six
B.
nine
C.
twelve
D.
sixteen
【单选题】To everyone's surprise, the difficult question was answered by a five-year-old boy in the end. [ ]
A.
publicly
B.
orderly
C.
swiftly
D.
correctly
【单选题】－What I told you just now is very important, _______? －Yes, it is clear.
A.
Do you agree
B.
What about you
C.
Have you got that
D.
Do you hear
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