Which of the following is NOT mentioned as a reason for the decline in amateur singing？
A. It is easier for people to please themselves with songs through TV.
B. People don't want to take the trouble to sing songs themselves.
C. Amateurs feel shy if they cannot sing as well as the professionals.
D. Famous and talented musicians are always willing to entertain people.
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未成年人申请国家助学贷款须由其法定监护人书面同意。()
A. 正确
B. 错误
Which of the following is the author's primary concern regarding the application of the new technology？
A. The expansion of the new technology may not bring profits to the companies.
B. Most people who use the technology will not have a baby as they want.
C. The effect of the new technology still needs to be carefully examined.
D. Increasing use of the technology may disturb the sex balance in the population.
The main idea of this passage is that ______.
A. TV and radio can amuse us with beautiful songs and music
B. TV and radio have weakened our interest in entertaining ourselves
C. people should not be too lazy or embarrassed to sing
D. parents should sing songs and read books aloud to their children
The sperm-separation technique is based on the fact that the chromosomes responsible for babies' sex ______.
A. are of different shapes
B. are of different sizes
C. can be identified
D. can be reproduced
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