Human ________ is controlled by reason as well as instincts.
A. behavior
B. behave
C. belief
D. behaving
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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
白天在能见度不良水域航行时_____①应打开航行灯;②可视需要开启航行灯。
A. ①对
B. ②对
C. ①和②都对
D. ①和②都不对