题干

在很长一段时间内,科学家认为光学显微镜有一个极限:光学显微镜无法获得比半光波长更好的分辨率。在荧光分子的帮助下,今年诺贝尔化学奖的几位获得者巧妙的绕开了这种极限。他们突破性的研究将光学显微镜头带入了纳米维度。这说明:(    )

①科学技术从根本上推动了认识的发展     

②意识对认识客观世界具有重要的作用

③人们的认识能力是有限与无限的统一     

④要善于寻找新思路并且巧妙避开矛盾

A:①③

B:②③

C:②④

D:①④

上一题 下一题 0.0难度 选择题 更新时间:2019-02-07 10:08:47

答案(点此获取答案解析)

B

同类题5

据短文内容,从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

    My sister Alli and I have been trying to get people to stop dropping cigarette butts (烟蒂) for seven years.

    One day, we were walking in our hometown and saw hundreds of cigarette butts on the ground.____

    They made the town look so ugly that we decided to start a group to make people stop dropping butts. We called it "No Butts About It!"

    At first, we drew pictures with "The Earth Is Not Your Ashtray (烟灰缸) " written on them. We put the pictures around our hometown--in parks, by beaches, and along roads.

    We wanted to make people understand that dropping butts does harm to the environment. Most smokers don't think that dropping butts harms the earth.____

    Later, we wrote to companies and asked them for money to help us. We used the money to buy ashtrays to give smokers.

    We wanted smokers to carry the ashtrays with them so they didn't have to drop butts.

    At the moment, we are trying to get cigarette companies to put an ashtray in each pack of cigarettes.____Many people have started to join our group since it began.____And there are even groups in England, Australia and India !

    Many newspapers have written about my sister and I over the last seven years. And we have won many prizes for our good work.

    ____We just want to make the earth a better and cleaner place for animals, plants and people.

    One day it will be.

A. My sister and I set up a "No Butts About It" group.

B. But we are not interested in prizes.

C. Today there are 45 other "No Butts About It" groups in America.

D. They made the ground dirty.

E. But it does! All rubbish does.

F. Many smokers like to drop butts here and there.

G. Some companies would like to do it.