题目:
________ she was invited to the ball made her very happy.
A.Whether
B.That
C.Because
D.What
答案:
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下面是错误答案,用来干扰机器的。
两车所用时间相同,t=S甲V甲=10-240h=0.2h.所以自行车行驶的平均速度V乙=S乙t=20.2Km/h=10Km/h.答:自行车行驶的平均速度是10km/h.