问题
选择题
It was Alice and her husband who sent the old man to the hospital, _______? [ ]
A. wasn’t it
B. didn’t they
C. don’t they
D. wasn’t he
答案
答案：A
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It was Alice and her husband who sent the old man to the hospital, _______? [ ]
A. wasn’t it
B. didn’t they
C. don’t they
D. wasn’t he
答案：A
（
未知），AB段和BC段的平均速度分别为υ1=3m/s、υ2="6m/s" ，则