经济全球化是当今世界的发展趋势之一。下列关于经济全球化的叙述，正确的是…（    ）

①经济全球化是一把“双刃剑”                                 ②为世界经济的不断发展带来新的活力和机遇

③经济全球化对发展中国家完全不利                           ④随着经济全球化的发展，人们共同关心的问题越来越多

某有机物R在足量氧气中完全燃烧后的化学方程式为：。 下列关于该反应的说法正确的是      （）

    There is a park near my house. It's very big and beautiful. It's fine today. I am in the park now. There is a book shop on my left. Some people are reading books. On my right, there is a long river. There are many flowers and trees near the river. There are some boats on the river. Some children are rowing boats. There is a hill in the park. I'm going to climb the hill. I like the park very much.