问题
单项选择题
动态作业的特点是
A．耗氧量少
B．能够持久
C．容易疲劳
D．容易引起损伤
E．恢复时间长
答案
参考答案：B
解析：动态作业是一种做功的劳动。由于肌肉交替收缩和舒张，血液灌流充分而不易疲劳，可以持久。
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动态作业的特点是
A．耗氧量少
B．能够持久
C．容易疲劳
D．容易引起损伤
E．恢复时间长
参考答案：B
解析：动态作业是一种做功的劳动。由于肌肉交替收缩和舒张，血液灌流充分而不易疲劳，可以持久。
Do you want to know something about children in Africa? What do they do for fun every day? Find out here: Education（教育） School is expensive for many African children. Lots of families can’t afford（支付不起）school uniforms or exercise books even though（尽管）they don't have to pay for school. For those lucky enough to go to school, they have a lot to learn. Some take two language classes: English or French, and their first language. There is also maths, science, history, social（社会的）studies and geography. Chores(繁琐的事) take up much of children’s time after school. They have to get water and firewood for the family every day. Also there’s cleaning, washing and helping with the meal. Daily（日常）fun It’s not all work and no play. Sports are very popular. Children can make goals（球门） with twigs（树枝）and their own footballs with string（绳子）. They play in the country（乡村）and streets of old towns. There’re many football teams for young people in Africa. Internet It's really expensive to get on the Internet. To get online （上网）for 20 hours costs over 600 yuan. Most people don’t have enough money for the fee（费用）. Egypt（埃及）and South Africa are the top two users of the Internet in Africa. All the people in the two countries can get on Internet. Some schools offer（提供）computer lessons but few students can enjoy computer fun at home.
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