[单项选择]Only in recent years have people begun to realize the importance of wildlife protection.
A. 直到近年来人们才越来越意识到保护野生动物的重要性。
B. 只是在最近几年里人们才开始发现并保护了很多重要的野生动物。
C. 直到近年来人们才开始意识到保护野生环境的紧迫性。
D. 直到近年来人们才开始了解保护野生动物的重要性。

[单项选择]Only in recent years have people begun to realize the importance of wildlife protection.
A. 直到近年来人们才越来越意识到保护野生动物的重要性。
B. 只是在最近几年里人们才开始发现并保护了很多重要的野生动物。
C. 直到近年来人们才开始意识到保护野生环境的紧迫性。
D. 直到近年来人们才开始了解保护野生动物的重要性。

[单项选择]Only in recent years ______ begun to realize that wild dogs, kept within bounds, often do more good than harm.
A. people have
B. since people have
C. have people
D. people who have

[单项选择]Only in recent years ________ begun to realize the importance of Internet.
A. people have
B. have people
C. that people have
D. since have people

[单项选择]Only (within) the past 200 years (scientists have) found (out what) fire (is).
A. within
B. scientists have
C. out what
D. is

[单项选择]After thirty years of television, people have become "speed watchers". Consequently, if the camera lingers, the interest of the audience ______.
A. broadens
B. begins
C. varies
D. flags

[单项选择]The rule that only people above 21 years of age can drink ______.

[单项选择]In recent years, railroads have been combining with each other, merging into super-systems, causing ______ concerns about monopoly.
A. enhanced
B. curbed
C. disrupted
D. heightened

[单项选择]It is only in the last decade that people have become aware of the threat to the quality of the environment by unrestricted industrial production.
A. posed
B. propelled
C. prompted
D. provoked

[单项选择]

Text 3 In recent years, railroads have been combining with each other, merging into super systems, causing heightened concerns about monopoly. As recently as 1995, the top four railroads accounted for under 70% of the total ton-miles moved by rails. Next year, after a series of mergers is completed, just four railroads will control well over 90% of all the freight moved by major rail carders. Supporters of the new super systems argue that these mergers will allow for substantial cost reductions and better coordinated service. Any threat of monopoly, they argue, is removed by fierce competition from trucks. But many shippers complain that for heavy bulk commodities traveling long distances, such as coal, chemicals, and grain, trucking is too costly and the railroads therefore have them by the throat. The vast consolidation within the rail industry means that most shippers are served by only one Rail Company/Railroads typically charge such "captive" shippers 20% to
A. the continuing acquisition
B. the growing traffic
C. the cheering Wall Street
D. the shrinking market

[单项选择]How many years do students have to study at community college in the United States
A. 4.
B. 3.
C. 2.
D. 1.