[单项选择]A bottle weighs more after air is put in. ______ proves that air has weight.
A. We
B. Which
C. It
D. What

[单项选择]A bottle weighs more after air is put in. proves that air has weight.
A. We
B. Which
C. It
D. What

[单项选择]Nowadays, college education has put more and more emphasis （） developing the students' practical skills,
A. on
B. in
C. over
D. into

[单项选择]That boys suffer more from air pollution can possibly be justified by the fact that ______.


A. the male have larger bones than the female
B. women can manufacture blood more efficiently than men
C. men usually breathe more deeply than women
D. women breathe as often as men

[单项选择]Now the air pollution in this city（）more and more serious with each passing day.
A. to become
B. became
C. becoming
D. is becoming

[单项选择]In recent years much more emphasis has been put ______ developing the students' productive skills.
A. onto
B. in
C. over
D. on

[单项选择]Over the years, more money has been put into education, but ______ in certain areas little has been achieved.


A. gravely
B. regrettably
C. forcibly
D. graciously

[单项选择]American schools tend to put more emphasis on developing ______ skills than they do on acquiring quantities of facts. Students are encouraged to ask questions, think for themselves and express their own opinions.
A. critical-thinking
B. interpersonal
C. intellectual
D. social

[单项选择]After the theft of his car he put in an insurance ______ for ￡3,000.


A. account
B. invoice
C. assessment
D. claim

[单项选择]After the war, a new school building was put up ______ there had once been a theatre．
A. that
B. where
C. which
D. when

[单项选择]America put more people in prison in the 1990s than in any decade in its history. That started a debate over the wisdom of spending billons of dollars to keep nearly 2 million people locked up. According to statistics, the United States ends 1999 with 1, 983, 084 men and women in prisons. That shows an increase nearly 840, 000 prisoners during the 1990s and makes the United States the country with the highest prison population in the world. With the cost of housing a prisoner at about MYM20, 000 a year, the cost in 1999 keeping all these prisoners behind bar is about MYM39 billion. Some experts argue that the money is well spent, saying the cost of keeping prisoners behind back doesn’t seem much in comparison to the cost of crime to society. They also point out that the rise in the prisoner population in the 1990s coincided with(与……相一致)a steady drop in the US crime rates. It is reported that serious crime has decreased for seven years continuously. "There are a noticeable number
A. America has put 2 million people in prison.
B. the cost for housing a prisoner keeps rising
C. billions of dollars has been spent on prisoners
D. the prisoner population is the largest in the world

[单项选择]More Americans are taking up education after retirements partly because ______.


A. they want to learn what they have no time to learn before retirement
B. they retire at an earlier age with more years left to learn
C. they are more wealthy to afford to continue the education
D. they find learning is a good way to fight against the process of aging