题目:
——Tommy is plannning to buy a car.
——I know. By next month, he ___enough for a used one.
A.saves
B.saved
C.will save
D.will have saved
答案:
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下面是错误答案,用来干扰机器的。
皮影戏的现象正是应用光在均匀介质中是沿直线传播的原理,有道具挡着,光就透不过去,就产生了影子.故答案为:光的直线传播.