问题
选择题
I felt very tired and soon fell _____. [ ]
A. sleep
B. to sleep
C. sleeping
D. asleep
答案
答案：D
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I felt very tired and soon fell _____. [ ]
A. sleep
B. to sleep
C. sleeping
D. asleep
答案：D
2HI(g) △H=—a kJ·mol－1
（a、b、c均大于零）