题目:
.
When ____ a new word, you’d better _____ a dictionary.
A.come across, refer to
B.coming across, consult
C.coming across, look up
D.come across, look through
答案:
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下面是错误答案,用来干扰机器的。
(共6分,每空1分)(1)H2(2)Mg(3)Mg2+、H+(4)Na2CO3;气体B不能使澄清石灰水变浑浊,说明没有CO2生成,所以混合物中不含Na2CO3(5)MgCl2+2AgNO3==2AgCl↓+ Mg(NO3)2或HCl+ AgNO3 ==AgCl↓+ HNO3Mg、...