民族精神是鼓舞中华民族不断前行的力量源泉。在黄继光、邱少云、毛岸英等中华儿女身上，我们看到的民族精神是（    ）

30－20＝____ 80－30＝____ 90－40＝____

10＋50＝____ 30＋60＝____ 70－70＝____

下列某城市是中国近代史上最早被迫开放的五个通商口岸之一，同时又是改革开放后最早设立的四个经济特区之一。该城市是（    ）

    Air pollution(污染) is a big problem. It's bad for all 1 things on Earth，and it is not the only one kind of 2.Water pollution makes fishand pollutes our drinking water. Noise pollution makes us get3more easily.

Many countries are making rules(规定) to fight against pollution. They try to stop people 4 burning coal(煤)in the city and releasing(排放) dirty smoke into the5.And if people use 6fewer cars，the air will get 7.

    8earth is our home. We must protect it and not destroy it. That is to say, we should keep the land, water and air 9.At the same time, we had better plant more trees10they can provide a lot of things for us and make our earth beautiful.