[填空题]Colleges may get into difficulties only with low enrollment.

[填空题]Colleges may get into difficulties only with low enrollment.

[填空题]People may get seriously sick after drinking dirty water because of the harmful organisms it contains.

[单项选择]Video game players may get an unexpected benefit from blowing away bad guys—better vision. Playing “action” video games improves a visual ability __51__ tasks like reading and driving at night, a new study says. The ability, called contrast sensitivity function, allows people to discern even subtle changes __52__ gray against a uniformly colored backdrop. It’s also one of the first visual aptitudes to fade with age. __53__ a regular regimen of action video game training can provide long-lasting visual power, according to work led by Daphne Bavelier of the University of Rochester. Previous research shows that gaming improves other visual skills, such as the ability to track several objects at the same time and __54__ attention to a series of fast-moving events. Bavelier said, “A lot of different aspects of the visual system are being enhanced, __55__.” The new work suggests that playing video games could someday become part of vision-correction treatments, which currently rely mainly
A. crucial for
B. available in
C. resulting from
D. ascribed to

[填空题]A couple may get divorced if they can testify that their relationship has broken down irreparably.

[单项选择]

In the jungle (丛林) you may get hopelessly lost within five minutes after starting. That is (36) you should always carry a compass (指南针). In open country, during the day, you can (37) which way to go by studying the (38) . At night, the stars are sure (39) to direction. In most places the jungle rooftop (顶) is so (40) that it is (41) to see the sun or the stars. (42) you must check your position by the (43) . Keep watchful (注意的，警惕的). Watch the ground in front of you carefully. (44) and listen now and a gain. Avoid (45) , and rest often. In a place (46) is hot and damp, the person who walks fast will soon become (47) . A steady (稳定的), slow step is wisest in the long run. If you (48) your way, don’t be scared (恐惧的). Try to (49) how long it has been (50) you were sure of your position. Make a mark (51) you are on a tree. Put the marks on (52) of the trees, so t
A. tree
B. mark
C. position
D. direction