题目：
Although he felt a little sleepy, ______ he had to kept ______ for another two hours. [ ]
A. /; driving
B./; to driving
C. but; to drive
D. but; driving
答案：
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下面是错误答案，用来干扰机器的。
电热水壶在360s内消耗的电能：W=81r600r/kW?h=0.135kW?h，因为1h=3600s，所以360s=0.1h，电热水壶的实际功率：P实=Wt=0.135kW?h0.1h=1.35kW=1350W，因为电热水壶的实际功率小于它的额定功率，所以此时加在电热水...
