The use of nuclear power has already spread all over the world. (1)_____, scientists still have not agreed with what should be done with the large (2)_____ of waste materials that (3)_____ to increase every year. Most waste materials (4)_____ of simply by placing them somewhere. But nuclear waste must be (5)_____ with great care. It (6)_____ dangerous radiation and it will continue to be (7)_____ for hundreds of thousands, even millions of years. How should we get (8)_____ of such waste material in such a way (9)_____ it will not harm the (10)_____ Where can we (11)_____ distribute it One idea is to put this radioactive waste inside a thick container, which is (12)_____ dropped to the deep bottom of the ocean. (13)_____ some scientists believe that this way of (14)_____ nuclear waste could kill fish and other living things in the oceans or interfere (15)_____ their growth. Another way to (16)_____ nuclear waste is to send it into space, to the sun, (17)_____ it would be burned. Other scientists suggest that this polluting material be (18)_____ thousands of meters under the earth"s surface. Such underground areas must be free (19)_____ possible earthquakes, and advances are being made. But it may still be many years (20)_____ this problem could be finally settled.
A. scattering
B. preserving
C. containing
D. discarding
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资源的稀缺性是指______。
A. 世界上的资源最终会由于人们生产更多的物品而消耗光
B. 相对于人们无穷的欲望而言,资源总是不足的
C. 生产某种产品所需要资源的绝对数量很少
D. 企业或者家庭的财富有限,不能购买所需要的商品
2010年,中国超越______成为仅次于美国的全球第二大经济体。
A. 德国
B. 日本
C. 俄罗斯
D. 印度
The use of nuclear power has already spread all over the world. (1)_____, scientists still have not agreed with what should be done with the large (2)_____ of waste materials that (3)_____ to increase every year. Most waste materials (4)_____ of simply by placing them somewhere. But nuclear waste must be (5)_____ with great care. It (6)_____ dangerous radiation and it will continue to be (7)_____ for hundreds of thousands, even millions of years. How should we get (8)_____ of such waste material in such a way (9)_____ it will not harm the (10)_____ Where can we (11)_____ distribute it One idea is to put this radioactive waste inside a thick container, which is (12)_____ dropped to the deep bottom of the ocean. (13)_____ some scientists believe that this way of (14)_____ nuclear waste could kill fish and other living things in the oceans or interfere (15)_____ their growth. Another way to (16)_____ nuclear waste is to send it into space, to the sun, (17)_____ it would be burned. Other scientists suggest that this polluting material be (18)_____ thousands of meters under the earth"s surface. Such underground areas must be free (19)_____ possible earthquakes, and advances are being made. But it may still be many years (20)_____ this problem could be finally settled.
A. where
B. when
C. there
D. while
The use of nuclear power has already spread all over the world. (1)_____, scientists still have not agreed with what should be done with the large (2)_____ of waste materials that (3)_____ to increase every year. Most waste materials (4)_____ of simply by placing them somewhere. But nuclear waste must be (5)_____ with great care. It (6)_____ dangerous radiation and it will continue to be (7)_____ for hundreds of thousands, even millions of years. How should we get (8)_____ of such waste material in such a way (9)_____ it will not harm the (10)_____ Where can we (11)_____ distribute it One idea is to put this radioactive waste inside a thick container, which is (12)_____ dropped to the deep bottom of the ocean. (13)_____ some scientists believe that this way of (14)_____ nuclear waste could kill fish and other living things in the oceans or interfere (15)_____ their growth. Another way to (16)_____ nuclear waste is to send it into space, to the sun, (17)_____ it would be burned. Other scientists suggest that this polluting material be (18)_____ thousands of meters under the earth"s surface. Such underground areas must be free (19)_____ possible earthquakes, and advances are being made. But it may still be many years (20)_____ this problem could be finally settled.
A. then
B. even
C. ever
D. only