单项选择题
The answer for preventing you from falling into a state of subhealth is that you should （）
A．work hard B．sleep more C．take more medicine D．be deep relaxed and form good living habits
单项选择题 As for food, experts suggest that （）
单项选择题 The underlined word "alternate" in this passage means （）
单项选择题 According to this passage, which of the following is right（）
