为鉴别分别盛有空气、氧气、二氧化碳的三瓶气体,应选用的方法是( )
A:将气体分别通入水中
B:将气体分别通入澄清石灰水中
C:将燃着的木条分别伸入三瓶气体中
D:将气体分别通入盐水中
阅读下面的短文,从所给的单词中选择合适的单词补全短文,每空只填一词,每词只准用一次,注意书写工整。
fly, flying, buy, take, taking, stay, bought, with, was, favourite, bored, fever
Sam ____ very sad last weekend. He was ill. He had a ____. His mother asked him to ____ in bed. He was very ____. Saturday afternoon, his good friends Tom and Mike came to see him. They ____a lot of fruit and some flowers for Sam. He was very happy.
This weekend, Sam is going to go hiking ____ his friends. They are going to fly kites, ____ pictures and play football. Because Sam likes____ kites. Tom's hobby is ____ pictures. And playing football is Mike's____ sport.