(Q).
Organic food, once considered something that only health fanatics desired, is now a regular feature at most supermarkets. And that has created a bit of a dilemma. On the one hand, you have a conventionally grown apple. On the other, you have one that's organic. Both apples are firm, shiny and red. Both provide vitamins and fiber, and both are free of fat, sodium and cholesterol. Conventionally grown food generally costs less, but is organic food a better choice? The advantages claimed for such foods over conventionally grown and sold food products are now being debated on a large scale. Supporters of organic foods -- a term whose meaning varies greatly --are frequently telling the world that such products are safer and more nutritious than others. The growing interest of consumers in the safety and nutritional quality of daily foods is a welcome development. However, much of this interest has been aroused by sweeping claims that the conventional food supply is unsafe or inadequate in meeting nutritional needs. Almost daily, the public is surrounded by claims for "no-aging" diets, new vitamins and other wonder foods. There are numerous unsubstantiated  reports that natural vitamins are superior to man-made ones, that fertilized eggs are nutritionally superior to unfertilized eggs, that untreated grains are better than those treated with insect spray and the like. Although most of these claims are not supported by scientific evidence, large amounts of written material about the benefits of organic foods makes it difficult for people to separate fact from fiction. As a result, claims that eating a diet consisting of organically grown foods prevents or cures disease or provides other benefits to health have become widely advertised and form the basis for people's opinion. One thing that most organically grown food products seem to have in common is that they cost more than conventionally grown foods. But in many cases consumers are misled if they believe organic foods can maintain health and provide better... What is the author's attitude towards the claims of organic foods? A) Doubtful. B) Enthusiastic. C) Supportive. D) Uninterested.
(A).
A


(Q).
Hu Li's heart sank due to the color of the air.Driving 140 kilometers from Tianjin City to Beijing last week,she held her breath as the air became a charcoal grey haze .The 39yearold businesswoman has lived in Beijing for a decade,and this past month,she said,brought the worst air pollution she has ever seen.It gave her husband a cough and left her sevenyearold daughter housebound ."My husband as well as I is working here,so we have no choice," she said."But if we had a choice,we'd like to escape from Beijing." The extended heavy pollution over the last month,which caused punishment in return for a day last week-called the "airpocalypse" by internet users- has largely changed the way that Chinese think about the country's air.On one day,pollution levels were 30 times higher than levels considered safe by the World Health Organization (WHO).Flights were cancelled.Roads were closed.One hospital in east Beijing reported they had treated more than 900 children for breathing issues.Bloomberg found that for most of January,Beijing's air was worse than that of an airport smoking area. The smog's  most threatening aspect is its high concentration  of PM 2.5 - particulate matter that is small enough to breathe deep into the lungs and enter the bloodstream,causing breathing infections,lung cancer and possibly damaging children's development.The WHO has estimated that outdoor air pollution accounts for two million deaths per year,65% of them in Asia. From the passage we know high concentration of PM 2.5  _  . A) can lead to choke B) can cause heart cancer C) will damage children's development D) will damage people's organ
(A).
D


(Q).
Scientist Florence Wambugu works with farmers in Kenya, a country in East Africa. She helps them grow bigger and better crops. Wambugu is especially interested in finding simple ways to produce more food. In the past ten years, Wambugu has spent much of her time studying sweet potatoes, which are an important food in her part of Kenya. A virus   kept attacking the plants. It stopped the sweet potatoes from growing well. Because of the virus, some farmers lost three quarters of their crops. Wambugu went to war against the virus. Her research for a way to save the sweet potatoes led to a lab in St. Louis, Missouri. The lab mainly works on genes  , the chemical "computer programs" found in the cells of living things. Genes tell a plant to produce pink flowers or an animal to grow black hair. Now scientists have found ways to move genes from one living thing to another. That process is called genetic engineering. Wambugu spent three years in the lab. As a result, she created a sweet potato plant that could fight off the virus. Wambugu tested her research in Kenya, and her plants produced wonderful sweet potatoes. That's just the beginning, Wambugu believes. Genetically modified   foods, she thinks, could help farmers in poor countries grow badly needed crops, thus, fewer people will go hungry. The text is written mainly to   _  . A) tell us sweet potatoes are in danger of being attacked by a virus B) introduce Wambugu's contribution to genetic engineering C) introduce a new way of killing plant viruses D) tell how hard Wambugu worked in her lab for three years
(A).

B