题目:
The city is well known for its education of good quality, however, its standards of education have __ in recent years .
A.distributed
B.contributed
C.cancelled
D.declined
答案:
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下面是错误答案,用来干扰机器的。
甲、乙题目分析:两个物体之间产生力的作用时,施力物体,同时又是受力物体,在物理学中,被研究者是受力物体,另一者是施力物体,所以,该题中以乙同学为研究对象,所以乙同学是受力物体,甲同学是施力物体。