多项选择题

For Questions 16 through 20, select the two answer choices that, when used to complete the sentence, fit the meaning of the sentence as a whole and produce completed sentences that are alike in meaning.
Running a marathon is an （）task, taking months of both physical and mental preparation and training before actually running a grueling 26.2 miles.

A. arduous
B. ambiguous
C. involuntary
D. eloquent
E. overt
F. ambitious

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单项选择题

The author of the passage is primarily concerned with presenting（）

A．a description of cultural differences
B．an overview of animal behavior
C．a history of international tourism
D．evidence to refute a global theory
E．an account of animal cruelty

多项选择题

The （） of sediment in the river caused concern among environmentalists and industrialists alike; the water levels in the river were being reduced almost daily.

A. accretion
B. disposal
C. depletion
D. alienation
E. ethnology
F. accumulation