[单项选择]A new technique（），the yields as a whole increased by 20 percent.
A. working out
B. having worked out
C. having been worked out
D. to have been worked out

[单项选择]A new technique （　）, the yields as a whole increased by 20 percent
A. working out
B. having worked out
C. having been worked out
D. to have been worked out

[单项选择]A new technique（）, the yields as a whole increase by 20 percent.
A. working out
B. having been worked out
C. having worked out
D. to have been worked out

[单项选择]A new technique ______ , the yields as a whole increased by 20 percent.
A. working out
B. having worked out
C. having been worked out
D. to have been worked out

[单项选择]A new technique having been worked out, the yields as a whole increased by 20 percent.（）
A. 一项新技术已经被研究出来，总产量在整体上已经提高了20%。
B. 一项新技术已经被研究出来，总产量提高了20%。
C. 由于研究出了一种新技术，总产量提高了20%。
D. 由于研究出了一种新技术，总产量在整体上已经提高了20%。

[单项选择]A new technique（）, the gross output increased by 20 percent.
A. working out
B. having worked out
C. having been worked out
D. to have been worked out

[单项选择]Which one of the following increased in New Zealand after 1984 A farm incomes B use of fertiliser C over-stocking D farm diversification

[单项选择]After the new technique was introduced, the factory produced（）tractors in 1998 than the year before.
A. as twice many
B. as many twice
C. twice as many
D. twice many as

[单项选择]Since the introduction of the new technique, the production cost ______ greatly.
A. reduces
B. is reduced
C. is reducing
D. has been reduced

[单项选择]It is believed that a new technique to ______ will probably be found.
A. recycle old aluminum products
B. discover more bauxite ores
C. make aluminum by putting ore particles under water
D. take out aluminum magnetically from poorer ores

[单项选择]A new technique ______ out, the yield increases by 20%.
A. having working
B. having been worked
C. at a loss
D. for good

[单项选择]Passage two Educating girls quite possibly yields a higher rate of return than any other investment available in the developing world .women’s education may be unusual territory for economists ,but enhancing women’s contribution to development is actually as much an economic as a social issue .and economics ,with its emphasis on incentives ,provides guideposts that point to an explanation for why so many girls are deprived of an education Parents in low-income countries fail to invest in their daughters because they do not expert them to make an economic contribution to he family :girls grow up only to marry into somebody else’s family and bear children .Girls are thus seen as less valuable than boys and kept at home to do housework while their brothers are sent to school-the prophecy becomes self-fulfilling ,trapping women in a vicious circle of neglect. An educated mother ,on the other hand ,has greater earning abilities outside the home and faces an entirely different set of ch
A. girls will turn out to be less valuable than boys
B. girls will be capable of realizing their own dreams
C. girls will eventually find their goals in life beyond reach
D. girls will be increasingly discontented with their life at home