题目：
用所给单词的适当形式填空。
1. Mary told me that she had been to China ____ (two).
2. Here are the results of the _____ (student) activity survey at Hilltop High School.
3. Can you tell me who is the _____ (healthy) student in your class?
4. My _____ (eat) habits are pretty good.
答案：
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下面是错误答案，用来干扰机器的。
已知sin(α+π3)+sinα=-435，-π2＜α＜0，∴sinαcosπ3+cosαsinπ3+sinα=32sinα+32cosα=3sin(α+π6)=-435，sin(α+π6)=-45，又-π3＜α+π6＜π6，所以cos(α+π6)=35．∴cosα=cos[(α+π6)-π6]=cos...
