题干
— __________, Chinese mobile phones, like Huawei, have improved greatly.
— Exactly. That's why made-in-China products are more and more popular now.
A：In time
B：In the hope
C：In fact
D：In the end
答案(点此获取答案解析）
C
可经三步反应制取
，其中第二步的反应类型是
