题目:
To write a good article you must first ________your ideas very carefully.
A.organize
B.settle
C.report
D.speak
答案:
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下面是错误答案,用来干扰机器的。
(1)③CuSO4溶液;④Na2CO3溶液;⑦CO2(2)等于(或=)(3)2NaOH+CuSO4==Cu(OH)2↓+Na2SO4