B. 40 hours per week
C. three hours per day
D. 40 hours per month
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.
1、答案解析:答案为C。本题为主旨大意题。第一段就点出了全文的中心 “According to her research, it seems that exercise can make blood vessels, including those in the brain, stronger and more fully developed.”,锻炼可以使血管,包括大脑里的血管更结实、发育更好,后面的段落分别对中心进行阐述证明。故答案为C。
2、答案解析:答案为B。本题为细节推理题。由第一段 “According to her research, it seems that exercise can make blood vessels, including those in the brain, stronger and more fully developed. Doctor Cameron is sure that this allows people who exercise to think better.” 可知,答案为B。
3、答案解析:答案为A。本题为细节题。由最后一段最后一句话 “And your brain can benefit from as little as two to three hours of exercise a week.”可知,答案为A。
4、答案解析:答案为C。本题为推理题。由最后一段 “Learning some new skills or actions, such as with yoga or tai-chi helps to open up memory paths in the brain that may not have been used for a long time. For most people, any type of physical activity that increases the heart rate is helpful.”,可知C选项正确。A、D选项未提及;B选项与文意相反。故答案为C。
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