[单项选择]One solution to major security problems is (71) , which are frequently installed to fix known security holes。
A. additions
B. compensations
C. patches
D. complements

[单项选择]One solution to major security problems is （），which are frequently installed to fix known security holes.
A. patches
B. compensations
C. complements
D. additions

[单项选择]One solution to major security problems is (71) , which are frequently installed to fix known security holes。
A. additions
B. compensations
C. patches
D. complements

[单项选择]One solution to major security problems is (72) ,which are frequently installed to fix known security holes.
A. additions
B. compensations
C. patches
D. complements

[单项选择]One solution to major security problems is ______, which are frequently installed to fix known security holes.
A. patches
B. compensations
C. complements
D. additions

[单项选择]One solution to major security problem is（），which are frequently installed to fix known security holes.
A. patches
B. compensations
C. complements
D. additions

[单项选择]One solution to major security problem is______，which are frequently installed to fix known security holes.
A. patches
B. compensations
C. complements
D. additions

[单项选择]One of the major problems most small businesses encounter today is ______ advertising is often costly and often takes some time to begin working.
A. because
B. that
C. What
D. how

[单项选择]

Text 1
One of the major problems of nuclear energy is the inability of scientists to discover a safe way to dispose of the radioactive wastes which occur throughout the nuclear process. Many of these wastes remain dangerously active for tens of thousands of years, while others have a life span closer to a quarter of a million years. Various methods have been used to date, but all have revealed weaknesses, forcing scientists to continue their search.
The nuclear process involves several stages, with the danger of radioactivity constantly present. Fuel for nuclear reactors comes from uranium ore, which, when mined,, spontaneously produces radioactive substances as byproducts. This characteristic of uranium ore went undetected for a long time resulting in the death, due to cancer, of hundreds of uranium miners.
The United States attempted to bury much of its radioactive waste material in containers made of steel covered in concrete and capable of holdi
A. it produces radioactive substances after it is dug out
B. it has caused deaths of many miners
C. the mining of it produces dangerous by-products
D. there is a problem in mining techniques

[单项选择]The primary solution to environmental problems is______.
A. to allow market forces to operate properly
B. to curb consumption of natural resources
C. to limit the growth of the world population
D. to avoid, fluctuations in prices

[单项选择]The problems requiring immediate solution will be given ______ at the meeting.
A. priority
B. urgency
C. superiority
D. emergency