单选题
Summer has come, making us think of all kinds of nice things, such as holidays in the country. The days are long and the nights are short, for the sun gets up early and goes to bed late in sunny June. It is one of the best and brightest months in the year. Birds sing all the day. As night falls, the birds stop their song, one after another. However, they do not all sleep. When other birds are silent, a soft (轻柔) cry comes, then, after a few moments, louder. It is the nightingale (夜莺) singing his beautiful song. The nightingale not only sings at night. On almost every warm day in early June, the little brown bird sings away on the roads and trees, but because all the other birds are also singing at the same time, we do not hear his voice so much. It is only at night, that we hear the nightingale at his best.
单选题
Why does the text say "they do not all sleep"?
【正确答案】
C
【答案解析】[名师解析] “They do not all sleep”这句话在文中第三段出现，文章说，夜晚降临时，鸟儿一个个地停止了唱歌，然而并不是所有的鸟儿都去睡觉了，当别的鸟安静下来时，夜莺开始唱歌了。因此这句话的意思是：“并不是所有的鸟儿都停止了唱歌，去睡觉了”，因为还有夜莺在唱。因此C是对的。