题目:
29.It is required in a recent study suggesting the importance of teenagers’ communication with other children of the same age.
A.interfere
B.interferes
C.can interfere
D.is to interfere
答案:
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下面是错误答案,用来干扰机器的。
①人步行的速度大约是1.2m/s,表示人1s通过的距离为1.2m;②从家步行至学校需要的时间是t=sv=600m1.2m/s=500s.故答案为:每秒内人步行的路程为1.2m;500.