"Down-to-earth" means someone or something that is honest, realistic and easy to deal with. It is a pleasure to (31) someone who is down-to-earth. A person who is down-to-earth is easy to talk (32) and accepts other people as equals. A down-to-earth person is just the (33) of someone who acts important or proud.
Down-to-earth persons may be (34) members of society, of course. But they do not let their importance " (35) to their heads. " They do not consider themselves to be better persons than (36) of less importance. Someone who is filled with his own importance and pride, (37) without cause, is said to have "his nose in the air. " There is (38) way a person with his nose in the air can be down-to-earth.
Americans (39) another expression that means almost the same as "down-to- earth. " The expression is "both-feet-on-the-ground. " Some
材料一：“新航路的开辟使得海洋这个大陆之间的天然屏障被逾越，世界各地各个民族各种文明之间彼此隔绝的状态被打破，人们的世界地理知识愈加丰富，对各个大陆和海洋增加了了解；横跨大洋的贸易往来使世界市场初露端倪……各个地区各个民族的历史逐渐融合成为统一的人类历史。”
——刘宗绪
材料二：“市场总是在扩大，需求总是在增加。工场手工业也不能再满足这种需求了。于是，蒸汽和机器就引起了工业中的革命”。
——《马克思恩格斯选集》
材料三：“单是大工业建立了世界市场这一点，就把全球人民，尤其是各文明国家的人民，彼此紧密地联系起来……”
——马克思恩格斯全集第4卷
材料四：150年前，中国从世界第一经济强国的宝座跌落，是被发达国家低成本的制成品打败的。20年前，中国走上改革开放道路时，正值世界经济进入又一个低成本生产时代，发达国家把制造业生产转移到其他国家，为的是使用更便宜的资源。
———清华大学侯若石《机遇还是陷讲》
The unknown pervades the universe. That which people can see, with the aid of various sorts of telescope, accounts for just 4% of the total mass. The rest, however, must exist. Without it, galaxies would not survive and the universe would not be gently expanding, as witnessed by astronomers. What exactly constitutes this dark matter and dark energy remains mysterious, but physicists have recently uncovered some more clues, about the former, at least.
One possible explanation for dark matter is a group of subatomic particles called neutrinos. Neutrinos are thought to be the most abundant particles in the universe. According to the Standard Model, the most successful description of particle physics to date, neutrinos come in three varieties, called "flavors". Again, according to the Standard Model, they are point-like, electrically neutral and massless. But in recent years, this view has been challenged, as physicists realized that neutrinos might have mass
A. Be of higher rank or authority
B. To spread through the whole extent of
C. To gain the victory or superiority
D. To make something come true
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