According to this passage, if you could not understand a passage, you （）
A. may not sit in the library
B. probably don't know its background
C. may not have practiced on reading it
D. probably think it is too easy for you to read
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Which of the following statements is NOT true（）
A. Getting off to work with a minimum effort helps save one's energy.
B. Dr. Kleitman explains why people reach their peaks at different hours of day.
C. Habit helps one adapt to his own energy cycle.
D. Children have energy cycles, too.
防酸隔爆型铅蓄电池安装间距应按制造厂的说明书规定，一般为( )。正负极用连接条、连接螺栓串联时，应在连接的螺栓上涂以中性凡士林油；螺栓连接应紧固。
A. 10mm
B. 15mm
C. 25mm
D. 35mm
In the Middle Ages, students （）
A. took objective tests
B. specialized in one subject
C. sat in a room full of candidates
D. never wrote in exams
固定型开口式铅蓄电池内裸硬母线支持点的间距不应( )。
A. 大于1m
B. 小于1m
C. 大于2m
D. 小于2m
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