B. evaluated the academic achievements of the students

　　C. analyzed the effects of the participants' tricky mental tasks

　　D. measured the changes of the students' understanding ability

　　69．According to Sanbonmatsu, people multitask because of their

　　________．

　　A. limited power in calculation

　　B. interests in doing things differently

　　C. inability to concentrate on one task

　　D. impulsive desire to try new things

　　70．From the last paragraph, we can learn that multitaskers usually

　　________．

　　A. drive very skillfully

　　B. go in for difficult tasks

　　C. fail to react quickly to potential dangers

　　D. refuse to explain the reasons for their behavior

　　2017·大纲全国卷] E

　　E

　　The oldest and most common source(来源)of renewable energy known to man, biomass is one of the most important forms of energy production in the United States and elsewhere.Since such a wide variety of biomass materials is everywhere—from trees and grasses to agricultural and city—life wastes—biomass promises to play a continuing role in providing power and heat for millions of people around the world.

　　According to the Union of Concerned Scientists(UCS), biomass is a kind of renewable energy source that produces no carbon dioxide(二氧化碳), because the energy it contains comes from the sun.When plant matter is burned, it gives off the sun's energy.In this way, biomass serves as a sort of natural battery(电池)for storing the sun's energy.As long as biomass is produced continuously—with only as much grown as is used—the “battery” lasts forever.

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