【简答题】Three things are necessary for us to keep alive. What are they? They are air, water and food. We eat food twice 46 three times a day. We drink water several times a day. We breathe air day and 47 . If...
【单选题】There _____ many kinds of birds around here, but now we seldom see them because of the air pollution. [ ]
【单选题】—Look, there _____ many birds around here, but now we seldom see them. What a pity! —Yeah! The air pollution has caused the problem! [ ]
【判断题】易货经济的效率很低,因为每种商品的价值都要用其他所有商品来表示,需要有超大量的价格数目。
【单选题】老年人除去饮食中所含水之外每日饮水量应是多少?
【单选题】There is air all around us, we can't see it.
【单选题】There _____ many kinds of birds around here, but now we seldom see them because of the air pollution. [ ]
【判断题】易货经济的效率很低,因为每种商品的价值都要用其他所有商品来表示,需要有超大量的价格数目。
【单选题】—Look, there_____ many birds around here, but now we hardly see them. What a pity! —Yeah! The air pollution has caused the problem!