正在行驶的汽车关闭发动机后，由于____仍然向前运动，但汽车的速度将____（选填“变大”、“变小”或“不变”），这是由于汽车受到____的缘故。

下列式子中去括号错误的是（   ）

2011中国城市竞争力测评纳入了“幸福感”指标，北京的产业层次竞争力排名第一，而在幸福指数一项排名第9。其原因为（）

阅读下列短文，从每小题的三个选项中选出最佳选项。B
    Water comes from the sea, the rain and the tap. Animals, plants and human beings all need water. It is important for our daily (日常的）life. We use water to wash clothes and vegetables. We use water to cook food, make drinks, wash our face and so on. Firemen use water to put out fires. Fanners use water to grow crops. Water is useful. We mustn't waste (浪费）water. We must save water. Turn off the tap when you are brushing your teeth. Don't take a shower too long. Use the same water many times.

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