更多"Frequent exposure to X-ray is harmf"的相关试题:
[单项选择]Exposure to asbestos fibers is harmful to people's health,______
A. so the use of asbestos is limited
B. but asbestos will continue to be used for a long time to come
C. so other new kinds of materials are under development
D. but they will not be so when ventilation devices are used
[单项选择]Frequent praise made the young man so conceited that he thought himself ______ in his position.
A. inaccessible
B. irresponsible
C. irremediable
D. irreplaceable
[单项选择]Smoking is so harmful to personal health that it kills people each year ______ than automobile accidents.
A. seven more times
B. seven times more
C. over seven times
D. seven times
[单项选择]Teachers encourage the use of dictionaries so that _______.
A. students win be able to express their ideas more freely
B. teachers will have less trouble in correcting mistakes
C. students will have more confidence in writing
D. students will learn to be independent of teachers
[单项选择]The great use of a school education is not so much to teach you things ______ to teach you the art of learning.
A. than
B. rather than
C. nor
D. as
[单项选择]My father is so deaf that he has to use a heating ______.
A. help
B. aid
C. support
D. tool
[单项选择]Only by making wise use of land______ to find a solution to the problem of hunger and famine.
A. we can be
B. we will be able
C. will we be able
D. can we
[单项选择]It is no use ______ a taxi. The hall is so near.
A. taking
B. to take
C. by
D. in
[单项选择]The arguments that cloning will have harmful effects ______.
A. are very convincing
B. have forced people to stop cloning
C. have forced people to question the concept of cloning
D. have compelled people to debate the implications of cloning
[单项选择]Because there is evidence of severely harmful effects from chemical dumps, the government has ______tougher cleanup measures.
A. imposed
B. impulsed
C. implemented
D. incorporated
[单项选择]That genetically-modified crops could have harmful effects that can be deduced from the fact that ______.
A. cross-breeding is a natural process
B. hybrids are generally more successful at breeding than natural plants
C. gene movement between cultivated plants and wild ones is inevitable
D. new research shows that genetically-modified plants are likely to develop into weeds
