农作物防霜冻的措施主要有依靠（）、（）、（）等。
参考答案：塑料薄膜覆盖；氲烟；水雾防霜冻
打开一个表应该使用的宏操作是_________。
Passage 3
Which of the following sectors is not represented in the Blomfield survey a. Banking. b. Financing. c. Insurance. d. Fashion design.
