题目内容

_____ economically, one tin of oil will last at least three months.

A. To use
B. To be used
C. Using
D. Used

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Human ________ is controlled by reason as well as instincts.

A. behavior
B. behave
C. belief
D. behaving

Human beings are different from animals _____ they can make use of languages.

A. whereas
B. in that
C. because of
D. consequently

号灯应在下列时间内显示＿＿＿＿。

A. 从日没到日出
B. 在任何情况下
C. A＋B
D. A、B均不正确

Mr. Brown’s monthly income has increased _____ 100 dollars.

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