It has been estimated that about one fifth to one third of the world’s farmable topsoil is being eroded at a rate that will seriously undermine future productivity.
A.stimulate B.weaken C.determine D.harness
We must improve the farming method ______ we may get high yields.
A.therefore B.as. C.in order that D.if
The question ______ tomorrow is whether income tax should be increased.
A.to be debated B.to debate C.debated D.that it will be debated
Directing the union are technological advances that have made it easier to store and rapidly transmit information into homes and offices. Fiber-optic cable, for example—made up of hair-thin glass fibers—is a tremendously efficient carrier of information. Lasers shooting light through glass fiber can transmit 250,000 times as much data as a standard telephone wire, or tens of thousands of paragraphs such as this one every second.The greatly increased volume and speed of data transmission that these technologies permit can be compared to the way in which a highway with many lanes allows more cars to move at faster speeds than a two-lane highway—hence, the information superhighway.
人们现在感到不满意，不是因为事情比以往更糟，而是因为比以往任何时候都好。以婚姻为例，在加利福尼亚，十对夫妇中有约六对离婚——在一些较富裕的社区这个比例还要高一些。必须承认，这些数字反映出许多不满。但人们从未像现在这样渴望和欢迎婚姻。的确，婚姻是如此地引人入胜，连很多正在办离婚的人几乎等不及法律许可，就想再度结婚了。
John boasted that he could finish the job all by himself in no time.
A.at any moment B.in time C.on time D.very rapidly