岩土在外力作用下会形成泥沙。一定流域内到达其出口断面处的泥沙数量称为该流域的产沙量。据此并读下图，回答下列问题。

下列各句中，没有语病的一句是（    ）

材料：1984年10月，国务院发布《关于农民进入集镇落户问题的通知》，规定凡在集镇务工、经商、办服务业的农民和家属，在集镇有固定住所、有经营能力或在乡镇企事业单位长期务工，准落常住户口，口粮自理。1997年6月，国务院批转公安部《关于小城镇户籍管理制度改革的试点方案》。根据此方案，已在小城镇就业、居住并符合一定条件的农村人口，可以在小城镇办理城镇常住户口。1998年8月，国务院批转公安部《关于当前户籍管理中几个突出问题的意见》，主要规定：实行婴儿落户随父随母志愿的政策；放宽解决夫妻分居问题的户口政策；投靠子女的老人可以在城市落户；在城市投资、兴办实业、购买商品房的公民及其共同居住的直系亲属，符合一定条件可以落户。户籍制度进一步松动。

——据黄匡时、王书慧《从社会排斥到社会融合：北京市流动人口政策演变》等

    It is said that about half of the people in China smoke. Many young boys and girls have the habit of smoking, though they are middle school students.
    More and more people have come to realize how serious this problem is. But they are never bored with it. ①Some people think it is a kind of fashion, some think it is of great fun and others think that smoking can relax themselves.
    Smoking causes many illnesses. A lot of people always cough(咳嗽)②______ ______smoking. The most serious illness caused by smoking is lung cancer. At the same time smoking is a waste of money. Beside, careless smokers may cause dangerous fires.
    It's known that smoking does harm to our health. We should get rid of(摆脱) the bad habit of smoking.