单项选择题
As for food, experts suggest that （）
A．We should eat less B．We should never eat meat C．We should have meals with less salt and sugar D．We shouht have meals without salt or sugar
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（）
单项选择题 Middle-aged people may feel subhealthy, because （）
