[单项选择]Britain's leading swimmers are facing a test of their ______ as well as their skills at the Olympic trials in Sheffield.
A. stamina
B. agility
C. fortitude
D. valor

[单项选择]Britain's leading swimmers are facing a test of their ______ as well as their skills at the Olympic trials in Sheffield.
A. stamina
B. agility
C. fortitude
D. valor

[单项选择]The DNA test, together with other tests, ______ the prisoner's innocence.
A. proves
B. prove
C. proving
D. have proved

[单项选择]The greatest task facing agricultural scientists in this region is the __________ of an adaptable farming system.
A. determination
B. distribution
C. discipline
D. evolution

[单项选择]The biggest difficulty facing historians might be their _______.
A. inability to offer convicting and correct explanations to each historical figure or event
B. lack of evidence for their interpretation
C. obsession with absolute accuracy
D. unwillingness to Doterpret history from different perspectives

[单项选择]英译汉：“roll test；stacking test；vibration test”，正确的翻译为( )。
A. 滚动试验；堆码试验；振动试验
B. 堆码试验；滚动试验；振动试验
C. 振动试验；堆码试验；滚动试验
D. 滚动试验；振动试验；堆码试验

[单项选择]What pressure is Sudan facing from the international community


A. To put down the Arab rebellion.
B. To disarm pro-government militias.
C. To stop expelling black Sudanese.
D. To grant self-rule to black Sudanese.

[单项选择]What problem is facing both developing and industrial nations
A. How to achieve literacy in their own countries.
B. How the environment can be changed to suit the people.
C. What methods of producing social and economic development can be found.
D. What ways of encouraging literacy as part of national development are possible.

[单项选择]The main task now facing ecologists, environmental activists and conservationists is______ .
A. to prevent pollution by legislation, economic incentives and persuasion
B. to arouse public awareness of the importance of environmental protection
C. to take radical measures to control environmental pollution
D. to improve the quality of life by enforcing environmental standards

[单项选择]The main task now facing ecologists, environmental activists and conservationists is ______.
A. to prevent pollution by legislation, economic incentives and persuasion
B. to arouse public awareness of the importance of environmental protection
C. to take radical measures to control environmental pollution
D. to improve the quality of life by enforcing environmental standards

[单项选择]

The biggest safety threat facing airlines today may not be a terrorist with a gun, but the man with the portable computer in business class. In the last 15 years, pilots have reported well over 100 incidents that could have been caused by electromagnetic interference. The source of this interference remains unconfirmed, but increasingly, exports are pointing the blame at portable electronic devices such as portable computers, radio and cassette players and mobile telephones.
RTCA, an organization which advises the aviation (航空) industry, has recommended that all airlines ban (禁止) such devices from being used during "critical" stages of flight, particularly take-off and landing. Some experts have gone further, calling for a total ban during all flights. Currently, rules on using these devices are left up to individual airlines. And although some airlines prohibit passengers from using such equipment during take-off and landing, most are reluctant to enforce a tot
A. a new regulation for all airlines
B. the defects of electronic devices
C. a possible cause of aircraft crashes
D. effective safety measures for air flight