—I just can’t give it up，however hard I try.

　　A．reason

　　B．excuse

　　C．cause

　　D．result

　　解析：考查名词辨析。cause表示引起某事的“起因，原因”，常与of搭配；reason用来陈述某事的理由，常与for搭配；excuse表示所找的借口；result表示事情的结果。

　　答案：C

　　14．You may have remembered this word，but it doesn’t ______ mean that you have mastered the use of it.

　　A．essentially

　　B．simply

　　C．necessarily

　　D．purposefully

　　A

　　Aquaponics(生态水培技术)is the idea of producing vegetables and fish in the same closed system.It combines aquaculture，or fish farming，with hydroponics，a way to grow plants without soil.Supporters see aquaponics as a way to increase world food supplies and reduce climate change，groundwater pollution and overfishing.

　　Sylvia Bernstein says the idea is as old as nature，“Aquaponics is really a recirculating wetland system，so it’s happening right on the banks of our lakes.”

　　Ms Bernstein grew plants in water with a chemical fertilizer(化肥)for years.Then she discovered she could use wastewater from fish to grow organic vegetables and fruit.

　　That was three years ago.Ms Bernstein built her first system with her son outside her home in Boulder，Colorado.Today she raises tilapia and trout.She feeds them once a day.Her plants grow in containers.There are no weeds in her aquaponics garden，and no need to worry about watering.

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