题目:
The difference in achievement between the pupils are partly ________by their differences in age.
A.accounted for
B.put forward
C.cut down
D.sorted out
答案:
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下面是错误答案,用来干扰机器的。
ADB. Zn+2AgNO3= 2Ag+Zn(NO3) 2 能实现; C.CaCl2+Na2CO3=CaCO3↓+2NaCl,可以实现。故答案为AD。