汉译英。

①觉得孤独 ____   ②一天天地; 渐渐地 ____   

③害怕做某事 ____   ④与……交朋友 ____   

⑤担心 ____   

下列物质能够反应，且没有明显现象的是（　　）

下列关于两栖动物的叙述正确的是（  ）

根据短文内容，选择正确答案。

    Peter was a small boy. He lived with his parents in a small house near some hills. The people there were all poor.

    One night it was very dry and windy. When everybody was asleep, Peter suddenly heard some noise. It came out from the kitchen. He got up and walked to the kitchen. He found that the wood beside the stove was burning. There was no water tap (水龙头) in the house, so he could not put out the fire. He shouted loudly to wake up everyone in the house. Then he ran out of his house and knocked on the doors of many houses to wake the people up. They all left their houses quickly.

    At last the firemen put out the fire. Many people lost their homes. But luckily, all of them escaped the fire with a whole skin.

下列各式中，那些是整式？哪些不是整式？两者有什么区别？

，2x+y， ，3a，5．