[单项选择]

A special education

Videodisc holds great promise of helping to meet the needs of American schoolchildren who have problems seeing, hearing, speaking, or socializing. Almost eleven percent of the students aged 3-21 in this country have an impairment that affects their ability to benefit from a regular education program. Handicapped students require special education because they are often markedly different from most children in one or more of the following ways: mentally retarded (发展迟缓的) learning-disabled, emotionally disturbed, deaf, visually handicapped, physically handicapped, or other health impairments. The education of these handicapped children is rewarding but challenging.
A special education student usually needs a longer period of time to acquire information. Repetitive teaching techniques are often beneficial, and indefatigable (孜孜不倦的) consistency on the part of the teacher is frequently necessary. Interactive videodisc c
A. genius students from day-care centers to colleges
B. students who are fond of computer video games
C. teachers of language in the University of Arizona
D. students who are either mentally or physically disabled

[单项选择]
Videodisc holds great promise of helping to meet the needs of American schoolchildren who have problems seeing, hearing, speaking, or socializing. Almost eleven percent of the students aged 3-21 in this country have an impairment that affects their ability to benefit from a regular education program. Handicapped students require special education because they are often markedly different from most children in one or more of the following ways: mentally retarded (发展迟缓的) learning-disabled, emotionally disturbed, deaf, visually handicapped, physically handicapped, or other health impairments. The education of these handicapped children is rewarding but challenging.
A special education student usually needs a longer period of time to acquire information. Repetitive teaching techniques are often beneficial, and indefatigable (孜孜不倦的) consistency on the part of the teacher is frequently necessary. Interactive videodisc c
A. its fancy design is very attractive
B. it allows the user to go back to where he wants to restudy
C. the content of it is healthy and promising
D. it is developed by university professors

[单项选择]Videodisc holds great promise of helping to meet the needs of American schoolchildren who have problems seeing, hearing, speaking, or socializing. Almost eleven percent of the students aged 3～21 in this country have an impairment that affects their ability to benefit from a regular education program. Handicapped students require special education because they are often markedly different from most children in one or more of the following ways: mentally retarded ( 发展迟缓的 ), learning-disabled, emotionally disturbed, deal visually handicapped, physically handicapped, or other health impairments. The education of these handicapped children is rewarding but challenging.The special education mentioned in the text is mainly concerned with ______.
[A] genius students from day-care centers to colleges [C] teachers of language in the University of Arizona
[B] students who are fond of computer video games [D] students who are either mentally or physically disabled

[单项选择] Genetic engineering holds great potential payoffs for farmers and consumers by making crops resistant to pests, diseases, and even chemicals used to kill surrounding weeds. But new research raises concerns that altering crops to withstand such threats may pose new risks from none other than the weeds themselves. This is due to the weeds ability to acquire genes from the neighboring agricultural crops. Researchers found that when a weed cross-breeds with a farm-cultivated relative and thus acquires new genetic traits possibly including artificial genes engineered to make the crop hardier the hybrid weed can pass along those traits to future generations. "The result may be very hardy, hard-to-kill weeds," said Allison Snow, a plant ecologist at Ohio State University in Columbus who conducted the experiments over the past six years along with two colleagues. They presented their results last week at the annual meeting of the Ecological Society of America in Madison, Wisconsin.
A. the results of recent research
B. dangers inherent in the nature of weeds
C. risks of altering crops’’ genetic make-ups
D. threats posed by chemicals used to kill weeds