——Do you think I should wear a hat to the party?
——It all depends on your own__________.
A. personality B. preference C. convenience D. selection
The government work report by Premier Wen covers a variety of issues, and the prices of agricultural products ______.
A. in common B. in general C. in particular D. in practice
Everyone here will thank the firefighter for the things they have done to prevent fires______the environment safer.
A. make B. to making C. to make D. from making
Japan says its prime minister promised to provide the world with "maximum transparency" about ____ accident at the Fukushima nuclear power plant during _____ telephone call.
A. the; a B. the; the C. an; the D. an; a
阅读下面背景提示，根据提示和所给写作内容用英语写一篇120词左右的短文。
背景提示：
Earth Hour is a global WWF (World Wildlife Fund) climate change plan. The campaign(活动) invites individuals, businesses, governments and communities to turn off their lights from 20:30 to 21:30 on the last Saturday in March every year to show their support for action on climate change. Earth Hour 2009 was held on March 28, 2009. More than 3000 cities from 80 countries and areas took part in it.
写作内容：
最近，你们班同学就 “地球一小时”活动展开了一场热烈的讨论。下表是这次讨论的结果。请你用英语介绍你们班的讨论结果并阐明你自己的观点。
|
60%的同学支持 |
40%的同学反对 |
你的看法 |
|
引起人们对全球气候变暖的关注 |
做秀，意义不大 |
…… |
|
节约能源 |
收效甚微 |
|
|
全世界共同努力，保护地球 |
给人们生活、学习和工作带来不便 |
|
|
…… |
…… |
注意：
1. 字数120左右；
2. 开头已给出，不计入总词数。
参考词汇：
全球变暖－global warming
做秀：show
不便：inconvenience
Last week our class had a heated discussion on Earth Hour.
___________________________________________________________________________
___________________________________________________________________________
___________________________________________________________________________
___________________________________________________________________________
___________________________________________________________________________
Have you ever wondered why there are so many skin colors in the world? Do you know why people living in particular areas usually have a certain color? Biology and history are the two reasons for this.
Skin contains something called melanin, which determines a person’s skin color. The more melanin a person has, the darker his or her skin will be. The amount of and the production of melanin are controlled by genetics, but can be affected by other things, such as sunlight. If a person lives in a place with less sunlight, a person’s body will produce less melanin, making the skin lighter.
Skin color is also affected by another source ---- vitamin D. humans all need vitamin D to build bones. People can get it by eating foods such as fish and milk, or from sunlight, so sunlight absorbed by melanin cannot be used for vitamin D production. Therefore, a dark—skinned person will produce less vitamin D than a light—skinned person when they received the same amount of sunlight.
The connection between vitamin D production and skin color is clear when we look at evolution. The earliest humans lived in Africa, their dark skin produced less vitamin D because of their dark skin. As a result, their skin made less melanin, so they could get enough sunlight to produce vitamin D. their skin gradually got lighter and they lost hair. Now, people living in areas with strong sunlight like Africa, have darker skin, while people living in other areas have lighter skin. The exception to this is the Inuit, who live in a place with little sunlight, but have dark skin because they eat a lot of fish and have enough vitamin D.
Evolution has given us a rainbow of skin colors. Humans have always had melanin to determine our skin color. What has changed through history is the environment where we have lived. This has in turn changed our melanin production, and eventually, skin color.
|
Brief 1 |
People living in a particular 2 usually have the same skin color and there are many different skin colors in the world. |
|
Reason for skin color |
The reasons for different skin colors mainly 3 in biology and history. |
|
Biology reasons |
The amount of melanin, by which a person’s skin color is __4 , varies from people to people. The more melanin a person has, the __5 his or her skin will be. Vitamin D is another source 6 skin color. Vitamin D is necessary for humans to build bones. Sunlight contributes to vitamin D in the skin. |
|
Historical reasons |
The earliest people in Africa hioknj006Dad dark skin with hair covering it because the sunlight is very strong. When they moved to places where they could not get enough sunlight to __7___ vitamin D, their skin color became lighter. Generally speaking, people in areas with strong sunlight, have darker skin ____8 people in other areas have lighter skin. |
|
9 |
Melanin 10 an important role in our skin color. With our living environment changing, melanin production is changed, which leads to the changes in our skin color. |
