读《画家乡》，按课文内容填空。

山山的家乡在____，他画的山那么____，水那么____。

根据短文理解，选择正确答案。

    New research has found that even if you give up smoking,the damage it has done to your genes（基因）will stay there for a much longer time.

    In the research,a team of US scientists studied the blood of 16,000 people.Among them,some were smokers,some used to smoke,and the rest were non-smokers.Scientists compared their genes and found that more than 7,000 genes of smokers had changed-a number that is one-third of known human genes.

    According to NBC News,both heart disease and cancer are caused by genetic changes.Some people may have had the changes when they were born,but most people get them in their day-to-day lives while doing things like  smoking.

    When you stop smoking,a lot of these genes will return to normal within five years.This means your body is trying to heal（治愈）itself of the harmful effects of smoking.But the changes in some of the genes stay for longer.They can stay for as long as 30 years.It’s almost like leaving a footprint on wet cement（水泥）一it will always be there, even when you’ve walked away and when the cement becomes dry.

    Although the study results may make people unhappy,there is a bright side: the findings could help scientists invent medicine to treat genetic damage caused by smoking or find ways to tell which people have heart disease or cancer ricks.

阅读理解

     Deputy (副职) Head Teacher Wanted

     Position：Deputy head teacher

     Employer：Bracknell Forest Council

     Published：10∶00 A．M.Mon.Dec.12,2011

     Closing date：10∶00 A．M.Mon.Jan.16,2012

     Working pattern：Full­time

     Salary：￡20,000－￡34,999 per year

     Location：Jennett’s Park Primary School，Bracknell，Berkshire

    The governors are seeking to employ an enthusiastic deputy head teacher to be a key partner in founding and leading our brand­new primary school in Bracknell.

     We offer：

    ●a brand­new school building

    ● the opportunity to work in close partnership with the head teacher and governors to create and develop a new staff team

    ●a growing community looking forward to their new school opening

    ●the opportunity for further professional development which will support you through the next stage of your career

    ●the opportunity to lead key projects across the school

    You will be：

    ●an excellent classroom practitioner (从业人员)，who will enjoy shaping and delivering a broad，balanced and creative curriculum in class

    ●able to lead the staff by focusing on teamwork

    ●committed to working in partnership with parents and the nearby community

    For further information，you can contact the head teacher，Ms Maria Soulsby，by dialing 32899918 or you can send an email to maria，soulsby @bracknell­forest.gov.uk. You can also come to visit our school in person.

     If you have not heard from us two weeks after the closing date，that means your application has not been accepted.Apply using Bracknell Forest Council application forms only；CVs (简历) will not be accepted.

    This school is committed to safeguarding and promoting the welfare of children and expects all staff to share this commitment.

    All staff employed in the school must be aware that a check on the criminal record will be done.

注： $\sqrt{n}$ 中的n表示作物所种的公顷数。

现有一个较大的生态系统，其中包括1000公顷（1公顷=10000米²）的农田、一个1.0×10⁵米²的湖泊以及一种必须加以保护的食鱼鹰等。又有2种可供选择种植的经济作用（作物1和作物2），一年只能种植一季，有关这2种作物种植所涉及的一些参数见上表。由表可知，不同作物的经费投入、收入、施药量及流失率不同。

湖水最初未受污染，种植作物后，会因农药的流失，有一定量的农药由流经农田的水流带入湖泊（假定流入湖泊中的农药不会流失），而湖泊中水的体积常年稳定在2.0×10⁵米³。湖水中的农药会沿着食物链：浮游藻类→食藻鱼类→食鱼鹰，在生物体内逐步积累，越到食物链的后端，体内农药的质量分数越大。假定该种食鱼鹰体内最大可承受的农药质量分数为2.69×10^-4，由此换算出湖水中农药的质量分数最大不能超过4.05×10^-6。

（注：①因源水质量巨大，在计算过程中可将湖水质量视作溶液质量；② $\sqrt{1000}\approx$ 32）请你运用所学的知识回答下列问题：