单项选择题
His fertile mind keeps turning out new ideas. The underlined part means （）
A．abundant B．unbelievable C．productive D．generative
单项选择题 What is the conversation mainly about（）
单项选择题 According to a number of students, （）is the main factor for early-age smoking.
单项选择题 Why were some children offered only fruit and milk for lunch（）
