答案　A　

　　．If a human being is hit by nuclear radiation, he may ________．

　　A．die of cancer after many years

　　B．die immediately

　　C．have a child who may be born weak

　　D．all of the above

　　答案　D　(2015·山东省威海市二模)

　　Run, swim, lift weights, do yoga—do something, because it's good for you. Many studies tell us that regular exercise not only helps our bodies but improves memory, and eases anxiety. But what is happening to the mind during workout to create all these benefits?

　　A new study from Sweden suggests that a specific protein found in trained muscles might contribute to exercise's mental benefits. This protein, the researchers found, might help our bodies process molecules that, if out of balance, can stress us and contribute to depression(萎靡不振). The findings were published in the journal Cell.

　　To test this, the researchers kept attacking some mice with flashing lights, loud noises and interrupting their sleep for weeks. Predictably, this treatment makes the mice show signs and biochemical markers of depression.

　　But not all the mice showed those signs. One group, specially raised to have high levels of a protein called PGC­1alpha1 (the one in trained muscles), did not show those depression signs. PGC­1alpha1 increases production of an enzyme that breaks down a chemical called kynurenine. Kynurenine helps the body respond to an activated immune system(活性免疫系统), but it also plays a role in depression.

【2017届重庆市高考英语一轮复习阅读理解选编精练：125（含解析）】相关文章：

★ （安徽专用）2014届高考英语一轮复习方案 作业手册（17）模块6 《Unit 17 Laughter》（含解析） 北师大版必修1

★ 2017届高考英语二轮复习课时训练：12（含解析）

★ 【三维设计】2017届高考英语（江苏专用）二轮复习素材：高考单词1.读美文记单词

★ 2017届高考英语二轮复习课时训练：6（含解析）

★ 2017届高考英语二轮复习课时训练：14（含解析）

★ 2017届高考英语二轮复习课时训练：5（含解析）

★ 2017高考四川省广安市英语阅读理解一轮系列训练：19（含解析）

★ 【北京专用】2014届高考英语一轮复习方案课时作业：必修1 Unit 5 Nelson Mandela

★ 2017届高考英语二轮复习课时训练：16（含解析）

★ 2017届高考英语二轮复习课时训练：20（含解析）