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【C19】

A. which
B. there
C. where
D. that

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Ships with crew are more costly mainly because of______.

A. pay and accommodation for sailors
B. hotel facilities needed on board
C. expenditure on more fuels
D. heating and plumbing

斯金纳认为学习的实质就是“反应概率上的一种变化”,这种变化可用操作性条件反射来解释。()

施工升降机附墙架安装尽可能保持水平,若有倾斜,其倾角一般最大允许为().

A. ±8°
B. ±6°
C. ±10°
D. ±12°

英国现行学制中,学前教育属于义务教育阶段。()

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