單項選擇題He seemed to be unaware（）the trouble he was causing.

A.for
B.on
C.of
D.about


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1.單項選擇題I can't see（）between these two books

A.a many difference
B.much difference
C.many difference
D.much a difference

2.單項選擇題Letters, maps and pictures are（）

A.essays
B.files
C.documents
D.records

3.單項選擇題No one knows who will call（）to solve the problem.

A.tune
B.tunes
C.the tune
D.a tune

4.單項選擇題He was late（）the traffic jam.

A.as result
B.as a result of
C.as the result of
D.a result of

5.單項選擇題There have been（）medicine in the last 50 years.

A.great advancesin
B.a great advancein
C.great advanceon
D.a great advanceon