The students are encouraged to provide ______ service to the poor students.
A. valuable
B. volcano
C. voluntary
D. voyage
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斯皮尔曼的二因素说指液态智力和晶态智力。
A. 正确
B. 错误
The new model costs twice______last year's.
A. more than
B. as much as
C. as many as
D. than
In other words, all mammals, ______their sizes are, breathe once for every four heartbeats.
A. however
B. regardless
C. whatever
D. according
A.throwB.walkC.climbD.fix
A. throw
B. walk
C. climb
D. fix