五、阅读理解
Biotech foods (转基因食品) are produced from animals and plants that have been made genetically different. Genetic alteration (基因改变) is nothing new. Humans have been changing the genetic features of plants for thousands of years by keeping seeds from the best crops and planting them the following years, and by breeding (培育) different kinds to make them taste sweeter，grow bigger，or last longer.
Traditional farmers always used plants or animals that were related (相关的)，or genetically similar. However，today's genetic engineers can change just a few genes at a time between species (物种) that are hardly related，or not related at all. There are surprising examples: Mouse genes are put into vegetable plants to make them produce more Vitamin C. Moth (飞蛾) genes are put into apple trees to help them from being harmed by diseases. Anyway，the purpose of traditional and modern ones is the same to add genes from an animal or a plant to make another grow better.
Q: ▲?
According to a report from the National Academy of Sciences，"Nothing can prove that these genetic foods (GE foods) are harmful to people." Some GE foods might even be safer than non-GE foods.
However，many people fear that when moving genes across completely different species，something could go wrong，with the possibility of unexpected health risk.
Q: Can biotech foods help feed the world?
According to the WHO，between 250,000 and 500,000 kids go blind every year in short of Vitamin A，with half of those children dying of losing their sight. "Golden rice"—a biotech variety named for its yellow colour—is thought to be a possible solution to the illness caused by Vitamin A shortage.
Other experts，however，hold the opposite opinion. "Golden rice alone won't greatly reduce Vitamin A shortage，" says Professor Nestle of New York University. "Whether it will improve Vitamin A levels remains to be seen."
Q: What's next?
Whether biotech foods will help solve world hunger or improve our lives remains to be seen. Their possibility is large，yet they carry risks. If science goes on with great care，testing new products completely and using dependable judgment (鉴定)，the world may avoid the dangers of genetic alteration while enjoying its advantages.
()1. Traditional farmers bred an animal or a plant by .
A. keeping the gene of the same plant each year
B. using some related plants or animals to breed
C. creating an animal or plant with special features
D. changing a few genes at a time from one plant to another
()2. What can be put in the ▲?
A. What exactly are biotech foods
B. How to add genes into biotech foods
C. Are biotech foods really safe for humans
D. Can biotech foods harm the environment
()3. The main idea of the last paragraph is .
A. with care，the safe use of biotech foods could possibly be realized
B. the world has already seen great progress thanks to biotech foods
C. biotech food development has been slowed by many risks
D. the risks of biotech foods seem to be greater than any possible advantage
()4. What's the best title for the passage?
A. Biotech Foods，Good or Bad?
B. Dangerous Biotech Foods
C. Plants and Animals
D. The Past of Biotech foods