更多"An annual census of wolves at Yello"的相关试题:
[单项选择]An annual census of wolves at Yellowsto ne National Park has found a sharp drop in the population. But park biologists, who suspect a deadly disease, canine parvovirus, say they will let nature take its course. "Parvo can be vaccinated for and can be treated, but we wouldn’t do it because we couldn’t catch every animal," Daniel Stahler. a park waif biologist, said. "And this allows them to build up a natural resistance."
The census found 22 pups, compared with 69 last year. The total count of wolves dropped m 118 from 171, the lowest since 2000. "It was somewhat devastating to have such poor pup survival," Mr. Stahler said. "But research shows that young pups can bounce back from it quite successfully." That pups have suffered the decline seems to suggest the culprit is parvo, said Ed Bangs, waif recovery coordinator for the United States Fish and Wildlife Service here. Nursing pups receive immunity from their mother’s milk. but the immunity drops when nursing stops.
The larg
A. the big litter is the cause of wolves’ decline
B. the scarce of food leads to wolves’ decline
C. parvo helps wolves to deal with overpopulation problem
D. wolves have trouble killing enough m feed
[单项选择]
COMMUNITY ANNOUNCEMENTS
Census night is November 8. Remember to fill in the census form you received in the mail to make sure that you and your family members are (144) .Tick off one of the boxes asking you whether you are married or, if you are single, and specify the number of (145) you have if you are married, in the space provided. Previous census forms have been quite confusing, and (146) residents did not respond accurately, leading to the gross under-reporting of our actual
144()
A. accepted
B. counted
C. granted
D. understood
[单项选择]The latest census is encouraging.
A. count
B. statement
C. agreement
D. estimate
[单项选择]The Census Bureau reported that the median family income, after adjustment for inflation, increased 1.6 percent in 1983. Poverty normally declines when family income goes up, but the national poverty rate remained at its highest level in eighteen years in 1983. The Census Bureau offered two possible explanations: the lingering effects of the deep and lengthy 1981-1982 recession, and increases in the number of people living in families headed by women and in the number of adults not living with any relatives. Both groups are likely to be poorer than the population as a whole.
Which of the following conclusions can be properly drawn from this report
A. The national poverty rate has increased steadily over the last eighteen years.
B. The national poverty rate will increase when there are lingering effects of an earlier recession.
C. The median family income can increase even though the family income of some subgroups within the population declines or fails to increase.
D. The category of adults not living with any relatives is the most critical group in the determination of whether the economy has improved.
E. (E) The median family income is affected more by changes in family patterns than by the extent of expansion or recession of the national economy.
[单项选择]The government requires that a census be taken every five years so that accurate statistics may be ______ .
A. composed
B. complemented
C. completed
D. compiled
[填空题]The 2000 decennial census aims at obtaining the exact number of population as well as a better picture of the extent of intermarriage in the United States.
[填空题]The results of census have always been the compromise of certain groups of interest.
[单项选择]
UNITED STATES POPULATION (official census 1890—1980)
|
Year | Population (in millions) | 10-year Increase (in millions) | Year | Population (in millions) | 10-year Increase (in millions) |
1890 | 62.9 | | 1940 | 131.7 | 8.9 |
1900 | 76.0 | 13.1 | 1950 | 150.7 | 19.0 |
1910 | l 92.0 | 16.0 | 1960 | 179.3 | 28.6 |
1920 | <
A. 3
B. 6
C. 16
D. 19
E. 29
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