问题
选择题
图是某生态系统中的食物网简图，有关叙述错误的是（ ）
A．该食物网中共有四条食物链
B．如果鹰的数量突然大量减少，则短时间内草的数量会减少
C．该生物系统组成成分是生产者、消费者和分解者
D．若此生态系统受到汞污染，一段时间后体内积累汞最多的生物是鹰
答案
答案：C
搜题请搜索小程序“爱下问搜题”
图是某生态系统中的食物网简图，有关叙述错误的是（ ）
A．该食物网中共有四条食物链
B．如果鹰的数量突然大量减少，则短时间内草的数量会减少
C．该生物系统组成成分是生产者、消费者和分解者
D．若此生态系统受到汞污染，一段时间后体内积累汞最多的生物是鹰
答案：C
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| There are many kinds of pollution around us, 1 air pollution, soil pollution, noise pollution and light pollution. They are bad 2 our health in many ways. Burning gas, oil and coal creates air pollution. It can cause sore eyes and 3 problems. With the increase of pollution and the development of industry, litter is everywhere. It makes our environment dirty. People put lots of rubbish in the land. Farmers use too many 4 in the fields. They destroy the soil. So soil pollution has become serious. Noise pollution can make people 5 . For example, people may lose their hearing if they work in a 6 place for a long time. Too much noise can cause high blood pressure 7 . Working for a long time in strong, changeable light 8 cause some kinds of illnesses. It makes people feel 9 and is especially bad for the eyes. With 10 pollution, our planet will become greener and our health will be better. Let's be greener people. | ||||
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