A

    It looks like there are more cats around us today. In fact, now there are about 58.1million pet cats in China. China has the second largest number of cat owners in the world 1 the United States. Every year, more young people take cats as pets.

    More cats bring more 2. Many people now work at pet shops and animal hospitals. But cats can become 3, too. Some people throw their pet cats away. Then the cats become 4. They can pass on diseases（疾病）, and they kill other animals like birds and frogs.

    So in Japan and Australia, the governments 5 homeless cats to animal hospitals. Doctors operate on them. So the cats can't have babies. In this way, the number of cats will not go up.

一人以每分钟60米的速度沿铁路步行，一列长144米的客车对面开来，从他身边通过用了8秒钟，列车的速度是____ 米/秒．

游共____画，唱共____画。

小梅和小丽的学习成绩都很优秀，小梅擅长理科，小丽擅长文科，两人之间是强有力的竞争对手。但出乎意料的是，她们在学习中却互相帮助，合作学习，最终二人同时被重点高中录取。这说明小梅和小丽（    ）