题目内容
在苯酚环上引入供电子基（如氨基、羟基、烷氧基、烷基）时
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Our company wants to purchase some low-price, high-quality ______________________ , such as cotton, leather, and woolen.
The world famous enterprise __________________________ business relations with our company in 2018.
According to a survey, the TV watchers like __________________________________ which show beautiful women in office, plane, and cars.
Do you think it is right to take sharp ____________________ to find out the one who sold our business secrets to our opponent?
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