能正确表示生物与其气体交换部位连线的是( )
①鱼——鳃 ②蚯蚓——体壁 ③家鸽——肺和气囊 ④蝗虫——气门.
A:①②
B:②④
C:①③
D:③④
A、B、C三个篮球队进行比赛,规定每场比赛的次日由胜队与另一队进行比赛,而负者则休息一天,最后结果为A对胜10场,B队胜12场,C对胜14场,则每队各赛了多少场?
Today is a nice day! The sun is shining. The birds are singing! Many people are p laying in the park! They are very happy! Look, the three girls are dancing! There are two boys flying the kite! There is a boy under the tree. He is listening to music. Some men are fishing. I love this day!
依次填入下列各句横线处的成语,最恰当的一组是( )
①他是一个心地善良的人,但性格懦弱、谨小慎微,做起事来总是_______,从来不敢越雷池一步。
②当今世界科技突飞猛进,我们更要勇于开拓,不断进取,如果_______,就会落后甚至被时代潮流所淘汰。
③想让中国传统戏曲焕发出新的生命力,决不能满足于现状,_______,唯有创新才是弘扬戏曲文化的康庄大道。