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2014年2月10日,湖南省第十二届人民代表大会第三次会议在长沙召开.湖南省人民政府省长杜家毫作《政府工作报告》.《报告》提出:全力推进湘江保护与治理等重点生态环保工作,以水更清为重点,抓紧实施省政府“一号重点工程”第一个“三年行动计划”;以山更绿为重点,强力推进山体修复、尾矿库治理和“矿山复绿”行动,启动重金属污染严重耕地的修复利用和作物结构调整试点工作;以天更蓝为重点,加大雾霾防治的工作力度、投资力度和政策力度,加强汽车尾气治理,推广新能源交通工具.

(1)湘江中所有的动植物构成一个生态系统,这种说法是否正确?____ .

(2)汞、镉、铅、砷等重金属能通过____ 积累,最终危害人类.

(3)绿色植物的____ 作用能吸收利用空气中的二氧化碳,净化空气.

(4)湘江中的中华鲟属于鱼类.下列动物中,与它亲缘关系最近的是____ .

A.章鱼    B.鲫鱼   C.娃娃鱼    D.鳄鱼

(5)“雾霾”天气对人体的健康有危害,当“雾霾”袭来时你对人们有何建议?(一条合理建议即可)____ .

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答案(点此获取答案解析)

错误,食物链和食物网不断,光合作用,B,尽量少出门,外出戴口罩

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    Nobody likes doing the dishes, but it turns out that doing this daily task might pay off in an unexpected way. According to a new study published in the Journal of Pediatrics, washing dishes by hand instead of using a dishwasher might prevent the development of allergies.

    Researchers in Sweden surveyed the parents of 1,029 children ages 7 and 8. They discovered that children whose families hand-washed the dishes instead of using a machine were less likely to have allergies.

    Earlier research has shown that dishes washed by machine are cleaner than those washed by hand. So why would kids who eat off slightly dirtier plates be better off when we talk about preventing allergies? One explanation is based on a theory known as the "hygiene hypothesis (卫生假说)," which says the reason why kids develop allergies is that their surroundings are actually too clean.

    Your immune (免疫) system keeps you healthy by fighting germs (病菌) like bacteria and viruses. But when you have allergies, it overreacts and tries to fight ordinary things like pollen (花粉) or certain foods.

    Being exposed to germs, particularly early in life, is good training for the immune system, says the lead author of the study, Dr. Bill Hesselmar of Queen Silvia Hospital in Sweden. "You excite the immune system in various ways and it becomes tolerant."

    This study shows that while using the dishwasher might be easier, the old-fashioned method of cleaning up could be better for your health.