[填空题]At least twenty-six of the introduced species have become established in Australia.

[填空题]A) Two species of deer have been prevalent in the Puget Sound area of Washington State in the Pacific Northwest of the United States. The black-tailed deer, lowland, west-side cousin of the mule deer of eastern Washington, is now the most common. The other species, the Columbian white-tailed deer, in earlier times was common in the open prairie country, it is now restricted to the low, marshy islands and flood plains along the lower Columbia River.
B) Nearly any kind of plant of the forest understory can be part of a deer’s diet. Where the forest inhibits the growth of grass and other meadow plants, the black-tailed deer browses on huckleberry, salal, dogwood, and almost any other shrub or herb. But this is fair-weather feeding. What keeps the black-tailed deer alive in the harsher seasons of plant decay and dormancy One compensation for not hibernating is the built-in urge to migrate. Deer may move from high-elevation browse areas in summer down to the lowland areas in late fa

[单项选择]Many people who fly at least occasionally have come down with a cold or the flu shortly after disembarking. Is the air in airborne commercial jets (21) The Association of Flight Attendants (AFA), (22) which 42000 flight attendants with 27 airlines are represented, evidently thinks so. The organization claims that the incidence of air-quality-related diseases has (23) among its members and demands that prompt actions be (24) to improve the conditions in the airplane cabin.
A study the AFA (25) in 1997 uncovered about 1000 self-reported incidents of headaches, dizziness and memory loss (26) flight attendants and passengers. Some flight attendants were too ill to (27) their safety duties, while others have been permanently disabled.
Because of airlines’ efforts to (28) their expenses, cabin-air filters are not cleaned (29) . The complaints of flight attendants do not always gi
A. beyond
B. under
C. against
D. below