Ultraviolet rays from the Sun can cause which of the following?
举一反三
- Which statement was NOT mentioned about viewing an eclipse A: Sunglasses block out only a limited amount of the sun’s ultraviolet rays that can damage the eye. B: Sunglasses can only filter harmful rays during total solar eclipses at their greatest magnitude. C: Sunglasses tend to cause the center of the eye to enlarge allowing in more intense light. D: Sunglasses should be used when any part of the sun is visible.
- The ultraviolet radiation from the sun can produce long-term effects on human beings and animals, but not on plants.
- All of the following are true EXCEPT ______. A: the atmosphere is important to none. B: a great deal of damage from the sun's deadly rays would be done to us, if there were no at mosphere. C: the atmosphere, as the author described, is the roof under which man can live safely on Earth. D: electricity in the atmosphere is being studied from every aspect.
- Which of the following words can be used to express cause and effect？
- Which cause of the following can lead to the engine not to start on air?（）