The release of chemicals known as chlorofluorocarbons (CFCs), used in aerosol sprays, is blamed for damaging this layer, and potentially increasing exposure of humans, animals and plants to dangerous levels of ultraviolet light.These chemicals have been banned in the USA and Canada, but many ...
This is partly because of the hole in the ozone layer(臭氧层).It lets in stronger and more dangerous ultraviolet light. Sometimes it's not the environment.That hurts heritage,but people. In the Amazon rainforests,logging(伐木)companies that want to use the wood for construction destroy some ...
Objects, like bits of old space rockets or satellites, move around the planet at very high speeds, so fast that even a very small piece can break important satellites or become dangerous to people, particularly astronauts. If the tiniest piece of junk crashed into a spacecraft, it could dama...
题目 Space is a dangerous place, not only because of meteors (流星) but also because of rays from the sun and other stars. The atmosphere again acts (67) our protective blanket on (68) . Light gets through, and this is essen- tial (69) plants to make the food which we (70) . H...
Space is a dangerous place not only because of meteors(流星) but also because of rays from the sun and other stars. The atmosphere again acts 1 our protective blanket on 2 . Light gets through and this is essential 3 plants
Ⅱ.完形填空Space is a dangerous place, not only because ofmeteors(流星) but also because of rays from the sun andother stars. The atmosphere again acts as our lblanket on Earth. Light gets through, and this is 2for plants to make the food which we eat. Heat, too,makes our environment...
Space is a dangerous place, not only because of meteors (流星)but also because of rays from the sun and other stars. The atmosphere again acts 1 our protective blanket on 2 . Light gets through, and this is essential 3 plants to make the food which we 4 . Heat, 5 , makes our envi...
UVC light is mostly absorbed by the Earth's atmosphere, but it is even more dangerous. Artificial UVC light can pass through the outer layer of skin and eye cells to ___95___ the living cells underneath. ___...
UV radiation, known as ultraviolet radiation, consists of invisible rays that form part of the energy that comes from the sun - they cause sunburn, and can raise the risk of skin cancer. UV radiation is made up of three kinds of rays:UVC, the most dangerous kind of ultraviolet light is...
To kill fish in lakes and reservoirs, rotenone is applied at low rates; thus, consumption of poisoned fish by either wildlife or humans is not dangerous. Irritation Derris powder was shown to be a mild local dermal irritant. However, it produced intense, though reversible irritation to the rab...