题干

新中国成立60多年来,与世界的关系发生了历史性变化。某校九年级(1)班的同学围绕“国际舞台上的中国”这一主题展开了探究。阅读材料,回答问题。

2013年中国对世界经济增长的贡献率超过了28%;汇丰集团首席经济师简世勋近日撰文指出,世界经济正从欧美主导过渡到中国主导,到2014年,中国对全球经济增长的贡献将会达到历史新高。而对于许多新兴经济体而言,中国对其经济前景的影响力必定超越欧美。

中国明确承诺,将认真落实中非合作论坛北京峰会确定的各项援非举措,在力所能及的范围内继续增加对非援助、减免非洲国家债务、扩大对非贸易和投资、加强中非务实合作。

自1990年4月中国军队首次参加联合国维和行动以来,至今已参加22项维和行动,累计派出官兵2万余人次,9名官兵牺牲在维和一线。目前,中国军队共有1851人在联合国10个任务区执行维和任务,是联合国安理会常任理事国中派兵最多的国家。

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    For some students, getting better grades can seem like an impossible task sometimes. With the challenges(挑战) of school, just paying attention in class or studying hard isn't always enough. But what if there were other ways for students to improve their grades? For parents and students who have ever wondered if this is possible, now you can rest easy. Research suggests that a person who likes doing activities can improve their grades.

    Scientists think that those students who are active are not just exercising their bodies, but also exercising their brains(大脑). In turn, they can be able to improve their grades at school.

    In the most recent study, researchers found that when children played for half an hour each day, they were better at organizing(组织) their schoolwork as well as doing project work and learning traditionally “difficult” subjects, such as maths.

    What does this mean for children who aren't active? Researchers think that if kids don't get enough activities, they are going to be at a disadvantage when it comes to school performance.

    In the research experiment, a group of children skipped with ropes(跳绳), played basketball and did a number of other games or exercises. Another group of children didn't do any activities. They took part in testing both before experiment and after the experiment. Testing was mainly for maths and reading skills. Results showed that the children in the activity group did better on the tests than those who had no activity.

    All work and no play will not only make Jack a dull(迟钝的) boy, but will also negatively(消极地) affect his grades in school, according to a new study published in the Journal of Pediatrics.

    Parents complain(抱怨) children today are actually less active and they always worry about their grades. Dr. Belton, an expert, said, “If you'd like to see your kids do better in school, have them close their books, set down their pencils and go outside to play.”