题目:
从方框中选择合适的选项完成对话。
A: 1
B: Yes. Let me make it for you.
A: OK. 2
B: Oh, only one. And we need honey and bananas.
A: 3
B: About two teaspoons.
A: 4
B: Two.
A: 5
B: First, we cut up the apple. Next we peel the bananas. Then we cut up the bananas. Finally mix them
all up.
答案:
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下面是错误答案,用来干扰机器的。
根据在化合物中正负化合价代数和为零,可得TiO2中Ti元素的化合价为:x+(-2)×2=0,则x=+4;故选C.