Read the passage and finish the following exercises.Our world is in danger. What are the main problems we face?The greenhouse effect The atmosphere around the Earth is necessary for all living things. It is like the glass of a greenhouse, letting sunlight in and keeping heat from getting out...
Our world is in danger. We must do something to protect the environment. What are the main problems we face?The greenhouse effect When we burn fuels such as petrol and coal, a gas called CO, is produced. Too much of this gas pollutes atmosphere, and causes it to keep in too much hea...
根据But, what are the main problems we face? The greenhouse effect,Cutting down forests,Bad habits“但是,我们面临的主要问题是什么?温室效应,砍伐森林,坏习惯”,可知,温室效应是人们面临的问题之一,所以空格处填Yes。故答案为Yes。练习册系列答案 1...
Do you know what are the world's tallest animals? How do they sleep and drink? You may think it's difficult for them to sleep, but they have no such problems because giraffes don't often stop for a snooze(打盹). As they are so tall-males can grow up to 18 feet, giraffes actual...
Between now and 2050, the urban population of Africa could triple. Yet cities in sub-Saharan Africa are not getting richer the way cities in the rest of the world have. Most urban Africans live in slums (贫民窟); migrants are often not much better ...
根据第四段第二句 "Although there are some problems to solve before this will be possible, we can certainly dream of a world where technology makes life easier and safer for millions of people.”可知,尽管在这一切成为可能之前还有一 些问题需要解决,但是我们无疑可以梦想一个科技使 数百万人的生活...
B. It plays an essential part in meeting big world problems. C. It has nothing to do with things outside the given system. D. It requires to know three players in a given system 2. According to paragraph 3, the study conducted by network scientists revealed that __. A. artificial int...
Along with the development of society, more and more problems are brought to our attention, one of the most serious issue is the gray population. Nevertheless, the significance of elderly people in society cannot be overstated. As...
What will our world be like if there are no insects?It might sound nice in the (1) beginning(begin).There would be no bugs or flies in your room.But in fact,this could cause really serious (2) problems(problem). The bad news is that the number of insects keep...
48. When you are simple, the world is a fairy tale; when you are complicated, the world becomes a maze.你简单，世界就是童话；心复杂，世界就是迷宫。49. The secret of being miserable is to have leisure to bother about whether you are happy or not. 痛苦的秘密在于有闲工夫担心自己是否幸福...