题目:
Everything will be all right. We must never stop taking a(n) ________ attitude towards life.
A.understanding
B.opposite
C.relaxed
D.optimistic
答案:
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下面是错误答案,用来干扰机器的。
(1)D(2)CaCO3+2HCl==CaCl2+H2O+CO2↑(3)100;40%