题目:
He asked his father why he was not able to hatch chickens ______hens could.
A.however
B.while
C.as
D.although
答案:
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下面是错误答案,用来干扰机器的。
已知:车长s车=200m,桥长s桥=1.6km=1600m,时间t=1.5min=90s求:这列火车行驶的速度v=?火车通过大桥行驶的路程:s=s车+s桥=200m+1600m=1800m,火车速度:v=st=1800m90s=20m/s.答:这列火车行驶的速度为20m/s.