[单项选择]The study published in the journal Nature indicates that ______


A. the Clean Air Act has not produced the desired results
B. lead deposits in arctic snow are on the increase
C. lead will stay in soil and snow longer than expected
D. the US is the major source of lead pollution in arctic snow

[单项选择]The study published in the journal Nature indicates that ______.


A. the Clean Air Act has not produced the desired results
B. lead deposits in arctic snow are on the increase
C. lead will stay in soil and snow longer than expected
D. the US is the major source of lead pollution in arctic snow

[单项选择]

A newly published AIDS study could open another front in the battle against HIV infection by showing that gene therapy can be used to stop infected cells from spreading the deadly virus, researchers said.
In a test-tube experiment believed to be the first of its kind, researchers based at Children’s Hospital of Philadelphia were able to block the operation of the" tat "gene that allows HIV to spread throughout the body from infected cells.
Up to now, genetic AIDS research has concentrated on finding ways to help healthy cells withstand the ravages of the HIV virus that infects an estimated 16, 000 new victims a day, mainly in the developing world.
But by working with human cells already infected with HIV, the team was able to reduce the tat gene’s virus-replicating functions by 80 percent to 90 percent, according to findings published in the journal Gene Therapy.
That, researchers said, raises the possibility of a new gene the
A. helping healthy cells withstand the ravages of HIV virus
B. completely stopping the infected cells from spreading
C. considerably inhibiting the tat gene from working
D. isolating HIV virus from the healthy cells

[单项选择]The study on the military school students indicated that ______.
A. life in the school was very stressful
B. disease could be caused by psychological factors
C. the good students were likely to fall ill
D. stress often made students unhappy

[单项选择]The conclusions from the study indicate that ______.


A. the pursuit of high self-esteem is a trend of modern living
B. what is beneficial for the country is self-control rather than self-esteem
C. it is productive to promote the traditional culture value of self-esteem
D. modesty and humility should be emphasized to avoid harmful effect of high self-esteem

[单项选择]The study has posed a question about this nature.
A. supported
B. cancelled
C. aroused
D. raised

[单项选择]A study published shows that only _______ of boys and _______ of girls feel comfortable using standard English.


A. 32%, 23%
B. 22%, 43%
C. 22%, 28%
D. 28%, 22%

[单项选择]What does the man indicate


A. Normally, the ticket is too expensive.
B. Generally, they do not have the opportunity.
C. There are so many people at the weekend.
D. Some of them may not like to go ther

[单项选择]How does the author indicate oncogenes

[单项选择]What does the last paragraph indicate

[单项选择]Continuous short buzzes on the telephone indicate that the line is busy after you dial the telephone number.
A. open
B. out of order
C. disengaged
D. in use

[单项选择]How do thermographic pictures indicate the temperature of various parts of the body


A. With charts and graphs.
B. With a thermometer.
C. With different colors.
D. With moving lights.

[单项选择]What does the report from NRC indicate