1 . Up to now lots of tests ________ (prove) that the system works.   (所给词的适当形式填空)

3 . 假定你是李华，暑期在伦敦学习，得知当地的美术馆要举办中国画展。请写一封申请做志愿者，内容包括：
1. 写信目的；2. 个人优势；3. 能做的事情。
注意 1. 词数80左右；
2. 可以适当增加细节，以使行文连贯;
Dear Sir，
_______________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

Yours,

Li Hua

5 . Is It Worth Buying Organic Food?

Organic food, grown without artificial chemicals, is increasingly popular nowadays. Consumers have been willing to pay up to twice as much for goods with organic labels (标签). However, if you think paying a little more for organic food gets you a more nutritious (有营养的) and safer product, you might want to save your money. A study led by researchers at Stanford University says that organic products aren’t necessarily more nutritious, and they’re no less likely to suffer from disease-causing bacteria, either.

The latest results, published in the Annuals of Internal Medicine, suggest that buyers may be wasting their money. “We did not find strong evidence that organic food is more nutritious or healthier,” says Dr. Crystal Smith-Spangler from Stanford. “So consumers shouldn’t assume that one type of food has a lower risk or is safer.”

For their new study, Smith-Spangler and her colleagues conducted a review of two categories of research, including 17 studies that compared health outcomes between consumers of organic against traditional food products, and 223 studies that analyzed the nutritional content of the foods, including key vitamins, minerals and fats.

While the researchers found little difference in nutritional content, they did find that organic fruit and vegetables were 20% less likely to have chemicals remaining on the surfaces. Neither organic nor traditional foods showed levels of chemicals high enough to go beyond food safety standards. And both organic and traditional meats, such as chicken and pork, were equally likely to be harmed by bacteria at very low rates. The researchers did find that organic milk and chicken contained higher levels of omega-3 fatty acids, a healthy fat also found in fish that can reduce the risk of heart disease. However, these nutritional differences were too small, and the researchers were unwilling to make much of them until further studies confirm the trends.

Organic food is produced with fewer chemicals and more natural-growing practices, but that doesn’t always translate into a more nutritious or healthier product. The U.S. Department of Agriculture (USDA) states that “Whether you buy organic or not, finding the freshest foods available may have the biggest effect on taste.” Fresh food is at least as good as anything marketed as organic.

1. The new research questions whether organic food ________.

A．should replace traditional food

B．has been overpriced by farmers

C．is grown with less harmful chemicals

D．is really more nutritious and healthier

2. Smith Spangler and her colleagues found that ________.

A．organic food could reduce the risk of heart disease

B．traditional food was grown with more natural methods

C．both organic and traditional food they examined were safe

D．there was not a presence of any forms of bacteria in organic food

3. Which of the following is relatively healthier according to the passage?

A．Organic chicken and pork.

B．Organic milk and chicken.

C．Traditional chicken and pork.

D．Traditional fruit and vegetables.

4. What is the author’s attitude toward organic food?

A．Doubtful.

B．Positive.

C．Unconcerned.

D．Approving.

6 . 阅读下面短文和问题，根据短文内容和每小题后的具体要求，在横线上写下相关信息，完成对该问题的回答。

Wearing masks is widely believed to be a simple but useful method to protect oneself from a variety of harmful things. In fact, masks have been helping mankind for centuries.

In the first century, many people in Roman Empire worked underground in mines. But most of them suffered from and even eventually died of breathing illnesses. To work out this problem, Pliny the Elder, a Roman philosopher (哲学家) and naturalist, recommended the use of animal bladder (膀胱) skins to stop dust from being breathed in. Thus, Pliny the Elder was considered the inventor of the first recorded mask.

Early inventions did not stop with Pliny. Around the 16th century, Italian artist and inventor Leonardo da Vinci suggested using a cloth wetted in water over the face to protect against the poisonous chemicals (化学物质).

The design of the mask took a big step forward in the 19th century. In 1848, American Lewis Hassley became the first person to get the official right to produce a protective mask for miners, which was a milestone in face mask history. Masks at this stage were similar to gas masks. Later, in 1897, Polish-Austrian doctor Johann von Mikuliez-Radecki designed a simple mask made up of one piece of medical gauze (纱布), recommending medical workers to wear it to prevent getting diseases. That was the first recorded use of a medical mask.

In 1910, a terrible disease broke out in Northeast China. Chinese doctor Wu Liande designed a cheap face mask called “Wu’s mask”, which was made of two pieces of medical gauze. This mask was praised by experts around the world, as it was simple and cheap to make.

With the happening of widely spreading diseases and the rise of air pollution, the materials in masks have continued to develop to better protect the wearers in modern times. For example, mask models such as N95 and KN90, which can help prevent smog from being breathed in, have become highly popular.

1. Who was considered the inventor of the first recorded mask? (不多于三个单词)
______________________________________________________________________
2. What was the first medical mask made of? (不多于两个单词)
______________________________________________________________________
3. Why was “Wu’s mask” praised by experts around the world? (不多于八个单词)
______________________________________________________________________
4. What is the main idea of the passage? (不多于四个单词)
______________________________________________________________________

7 . He had teams of dogs ________ (pull) the sledges and all his men were on skis. (所给词的适当形式填空)