题干

过去,人们认为杂草会抢夺果树营养,把草拔光。这样一来,病虫害增多,农药使用量也 随之加大,最后形成恶性循环。现在,一些果园在果树周边保留杂草、灌木,虽然会有害 虫,但益虫、小鸟也来了,有了生物多样性,病虫害明显减少,农药就可以少用或不用,水 果的口味也变得异常鲜美。这说明
①事物的发展离不开主观意识的参与
②要尊重和服从规律,才能正确利用和改变规律
③矛盾双方既对立又统一,推动事物的变化和发展
④联系具有多样性,要具体分析事物存在和发展的条件

A:①②

B:①③

C:②④

D:③④

上一题 下一题 0.0难度 选择题 更新时间:2019-03-14 09:30:01

答案(点此获取答案解析)

D

同类题2

阅读理解

    Hundreds of years ago, news was carried from place to place by people on foot or by horse. It took days, weeks and sometimes months for people to receive news. Now it is possible to send words and pictures around the world in seconds(秒). Billions of people learn about news stories of their own country and all over the world every day, either by watching TV or reading newspapers. Newspapers have been an important part of everyday life since the 18th century. Many countries have hundreds of different newspapers. How do newspaper editors(编辑) decide which news stories to print (印刷)? Why do they print some stories and not others? What makes a good newspaper story?

    Firstly, it is important to report new stories. TV stations can report news much faster than newspapers. Yet, newspapers give more about the same story. They may also look at the story in another way, or they may print completely (完全地) different stories to those on TV.

    Secondly, a news story has to be interesting and unusual. People don't want to read stories about everyday life As a result, many stories are about some kind of danger and seem to be "bad" news. For example, newspapers never print stories about planes landing safely, instead they print stories about plane accidents.

    Another factor(因素) is also very important in many news stories. Many people are interested in news in foreign countries, but more prefer to read stories about people, places and events (事件) in their own country. So the stories on the front page in Chinese newspapers are usually very different from the ones in British, French and American newspapers.