题目内容

Mood many be defined _______ a temporary and mild positive or negative feeling that is generalized and not tied to any particular circumstance.

A. as
B. about
C. by
D. with

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But experts say Japan is unique in that sales have been decreasing steadily ______ time.

A. over
B. against
C. on
D. behind

This is where cities expand quickly into rural areas, sometimes ______ a much faster rate than urban population growth.

A. in
B. beyond
C. with
D. at

The new report says almost two hundred thousand people move ______ cities and towns each day.

A. onto
B. into
C. around
D. upon

They also carry out research work aimed ______ extending man’s knowledge of these objects.

A. at
B. by
C. to
D. in