有助于大脑的发展和更好地思考，然后后面几段通过实验说明了运动是如何做到这一点的，故答案为C。

2.According to the passage，what is the connection between exercise and brain development?

A. Exercise helps soften our blood vessels.

B. Physical exercise helps us think better.

C. The brain needs special mental exercise.

D. The more exercise，the bigger the brain.

答案　B

解析　细节理解题。根据第一段中的"Dr Cameron is sure that this allows people who exercise to think better...exercise can actually cause physical changes in the brain."可知，运动能够让人们更好地去思考，让大脑产生一些物理变化，因此B项表述是正确的。

3.For ordinary people，the smallest amount of exercise required to gain any benefit is .

A. two hours per week

B.40 hours per week

C. three hours per day

D.40 hours per month

答案　A

解析　细节理解题。根据最后一段末句"And your brain can benefit from as little as two to three hours of exercise a week."可知，每周只需要2－3个小时的锻炼就可以让大脑获益了。故对普通人来说，最少的运动量是每周2个小时，答案为A。

4.Why is yoga suggested for seniors?

A.It does good to the joints of old people. B.It does not increase the heart rate.

C.It includes learning new actions. D.It can be done in groups.

答案　C

解析　细节理解题。根据最后一段中的"Learning some new skills or actions，such as yoga or tat-chi，helps to open up memory paths..."可知，推荐瑜伽是因为它可以学习到新的技能和动作，有助于大脑记忆的开发，故选C。

Ⅱ.七选五

(2018•安徽江淮名校高二期中)

The playing field is never fair or equal. 5 Knowing what you can do to have an advantage can make the difference between success and failure.

My kids tell me it's unfair to play with the big children. I tell them that's right. Unfairness is a good thing. There is more to be gained by the effort when things seem unfair. It's true that many things in the world are unfair. 6 For example，the early bird catches the worm. It's unfair that the bird that sleeps in misses out on breakfast，but it's nice to know that if it gets up early it's sure to get the worm.

I always try to explain to my kids that complaining about how unfair something is will get them nowhere. 7 Once you do that you are in the advantage. Above all，you have to focus on gaining that unfair advantage and in order to do that，build your inner strength. When you empower yourself，you are gaining skills or abilities，confidence and self-esteem(自尊). 8 Where do you want to be financially