练习题 1 They know that the inside of the earth is very hot, but they are not sure what causes the great heat. Some scientists now believe that much of heat 1.__________ inside the earth is provided by the radioactive elements. 2 Communications satellites have made it possible for an entire world be closer than ever before. 2.__________ 3 A lighthouse must be high enough for its light to be seen far away, but if it is too high, it has more possibility to be destroyed by high wind; so it is always true to say that the higher it is better. 3.__________ 4 Scientists have suggested that supersonic aircraft may disturb the upper atmosphere to such extent that dangerous radiation from the 4.__________ sun might reach the earth. 5 Nowadays, higher education does not make as much difference to the jobs women take as it does in case of men. 5.__________ 6 More than 90 percent of cigarette smoke is made up of about dozen hazardous gases, 6.__________ carbon monoxide being the most important. 7 Primates are also known for their great intelligence, related in a part to their great 7.__________ awareness of the environment plus the ability to manipulate this environment 8 This tendency of technology to make workers superfluous but at same time allowing 8.__________ their numbers to grow so large is deceasing psychological tensions. 9 Most of the dollar differences stem from fact 9.__________ that women tend to be more recently employed and have fewer years on the job. 10 This island is to south of North Korea. 10.__________
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