单项选择题
The weather conditions during the growth of crops （）.
A. show that organic crops are safer than conventional ones B. be specially trained C. improve soil quality D. poison you E. be eaten F. affect their nutritional content
单项选择题 Paul Ekman studies people’s faces in different cultures.（）
单项选择题 Paragraph 1（）
单项选择题 Ekman did research in several countries and got different results.（）
