[单项选择]The habit of economy one of the greatest differences between the savage and civilized men.


A. contains
B. Contributes
C. constitutes
D. continues

[单项选择]The habit of economy one of the greatest differences between the savage and civilized men.
A. contains
B. Contributes
C. constitutes
D. continues

[单项选择]A barter economy is one in which______
A. value is decided by weight
B. value is decided by number
C. money is used and goods are not exchanged
D. goods are exchanged an, d money is not used

[单项选择]To get into the habit of smoking means （　） one's own life short.
A. make
B. making
C. to make
D. made

[单项选择]Dickens is one of the greatest critical realist writer of ______.


A. the Modern Period.
B. the English Renaissance.
C. the Romantic Period.
D. the Victorian Age.

[单项选择]One of California' s greatest problems is providing ______ water to meet the needs of its expanding population.


A. adverse
B. adjacent
C. adequate
D. aesthetic

[单项选择]One of California's greatest problems is providing {{U}}adequate{{/U}} water to meet the needs of its expanding population.
A. sufficient
B. palatable
C. suitable
D. unpolluted

[单项选择]

C
One of the greatest killers in the Western world is heart disease. The death rate (率) from the disease has been increasing at an alarming Speed for the past thirty years. Medical experts know that people can reduce their chances of getting heart disease by exercising regulary, by not smoking, by changing their diets, and by paying more attention to reducing stress (压力) in their work.
However, Western health-care systems are still not paying enough attention to the prevention of the disease. There is a need for more programs to educate the public about the causes and prevention of heart disease. In stead of supporting such programs, however, the U. S. health-care system is spending large sums of money on the surgical (外科的) treatment of the disease, after it develops. This emhasis (强调) on treatment clearly has something to do with the technological advances that have taken in the past ten to fifteen years. In this time, modern technology, has enabled doctor
A. more money should be spent on the prevention of heart disease
B. heart surgery has helped most patients improve their conditions
C. modern technology has made heart surgery more risky than before
D. the public have known a great deal about the causes of heart disease

[单项选择]

Passage 1
One of the greatest mysteries in the study of Cetacea [aquatic mammals] has always been that the creatures found in the stomachs of toothed whales show no teeth marks. Now a University of California at Santa Cruz professor thinks he may have solved the enigma with what he calls the "big bang" theory of cetacean predation.
Ken Norris, natural history professor, believes that rather than use their teeth to attack their victims, toothed whales stun their prey with intense bursts of sound. He points out that all 68 species of odontocetes (a sub-order that includes dolphins) use sound to locate their victims, and suggests this ability may have evolved to the point where it could be used as a weapon.
Millions of years ago, the ancestors of whales had a narrow tapered jaw, streamlined for speed and bristling with long rows of sharp teeth. Today odontocetes are not adapted to surprising their prey or trapping it quickly. Most are
A. argue for a ban on the capture of whales and dolphins
B. describe the evolution of whales
C. report a possible explanation for the lack of teeth marks on whales' victims
D. reveal the flaws in the "big bang" theory of cetacean predation