[单项选择]Proper lighting is a necessary for good eyesight even though human night vision can be temporarily impaired by extreme flashes of light（）.
A. needful
B. necessity
C. exigency
D. need

[单项选择]Which set is a proper subset of E ( ) E= {0,1,2,3}
A. { x
B. { x
C. { x
D. {0,1,2,3)

[单项选择]Spiders have excellent eyesight and can see their __________ from a distance twenty times their own length.
A. victim
B. prey
C. pest
D. nest

[单项选择]Although afflicted by（）serious eyesight problems, Alicia Alonso was one of（）principal stars of（）American Ballet Theater.
A. the.../.../
B. /...the...the
C. the...a.../
D. /...a...the

[单项选择]It does harm to your eyesight to read books in the ____________ light of a candle.
A. colorless
B. dim
C. pale
D. transparent

[单项选择]Poor eyesight will ______ you from military service.
A. prevent
B. restrain
C. exempt
D. stop

[单项选择]His eyesight is poor; he ______ wear glasses at least in class.
A. can
B. must
C. may
D. could

[单项选择]A human's eyesight is not as ______ as that of an eagle.
A. eccentric
B. acute
C. sensible
D. sensitive

[单项选择]A human's eyesight is not as __________ as that of an eagle.
A. eccentric
B. acute
C. sensible
D. sensitive

[单项选择]You may make good grades by studying only before examinations, but you will succeed eventually only by studying hard every day.
A. in due course
B. in the long run
C. in the main
D. in the first place

[单项选择]Which title is proper for this passage

[单项选择]

Without proper planning, tourism can cause problems. For ex ample, too many tourists can crowd public places that are also enjoyed by the inhabitants of a country. If tourists create too much traffic, the inhabitants become annoyed and unhappy. They begin to dislike tourists and to treat them impolitely. They forget how much tourism can help the country’s economy. (79)It is important to think about the people of a destination country and how tourism affects them Tourism should help a country keep the customs and beauty that attract tourists. Tourism should also advance the well— being of local inhabitants.
Too much tourism can be a problem. If tourism grows too quickly, people must leave other jobs to work in the tourism industry. This means that other parts of the country’s economy can suffer.
On the other hand, if there is not enough tourism, people can lose jobs. Businesses can also lose money. It costs a great deal of money to build la
A. an increase of unemployment
B. a decrease in tourist attractions
C. the higher cost of support facilities
D. a rise in price and a fall in pay

[单项选择]To create a proper framework for effective private pensions, the government should______.
A. increase the income to encourage voluntary pension saving
B. encourage voluntary pension saving
C. make good use of administrative costs
D. not command people to save private-pensions

[单项选择]What is the proper title for this passage
A. Principles of the Classroom.
B. Rules for Students.
C. American Classroom Customs.
D. International Customs.

[单项选择]

Dogs are social animals and without proper training, they will behave like wild animals. They will soil your house, destroy your belongings, bark excessively, fight other dogs and even bite you. Nearly all behavior problems are perfectly normal dog activities that occur at the wrong time or place or are directed at the wrong thing. The key to preventing or treating behavior problems is learning to teach the dog to redirect its normal behavior to outlets that are acceptable in the domestic setting.
One of the best things you earl do for your dog and yourself is to obedience train (驯服) it. Obedience training doesn’t solve all behavior problems, but it is the foundation for solving just about any problem. Training opens up a line of communication between you and your dog. Effective communication is necessary to instruct your dog a- bout what you want it to do.
Training is also an easy way to establish the social rank order. When your dog obeys a simple request
A. To show their willingness to obey.
B. To show their affection for their masters.
C. To avoid being punished.
D. To win leadership of the dog pack.