2017届高考英语一轮复习知识梳理练习：必修1 Unit 2 Heroes（北师大版）_高考复习指南

　　1.Which of the following can not be known from the passage?

　　A.Antioxidants are responsible for plant colors.

　　B.Plants use color to attract attention.

　　C.Antioxidants can protect plants from UV light.

　　D.Antioxidants help free radicals to attack plants.

　　2.In which order do the following facts occur?

　　a.Wrinkled skin can be seen.

　　b.UV light causes free radicals to form.

　　c.Free radicals damage cells in our bodies.

　　d.The sun gives out UV light.

　　A.a,b,c,d B.d,b,c,a C.c,a,d,b D.d,b,a,c

　　3.We need extra help for fighting off free radicals from fruits and vegetables because.

　　A.our bodies’ defences are not natural

　　B.we are too young to defend ourselves

　　C.our defences get weaker as we get older

　　D.our bodies’ built-in defences can only go away

　　4.Which of the following can not cause free radicals to form?

　　A.Colorful food. B.UV light from the sun.

　　C.Polluted air. D.The body itself.

　　【文章大意】本文是一篇说明文。文章讲述了太阳的紫外线、烟雾、汽车尾气、工厂的废气等都可造成自由基的生成,自由基会破坏人体细胞,各种颜色的食物是帮助我们抵抗自由基的有效方法。

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