单项选择题

This passage is mainly about _____.

A．how inhaled dust harms the lungs
B．the function of Environmental Protection Agency
C．the function of human alveolar macrophages
D．studies by Environmental Protection Agency

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热门试题

单项选择题

Which of the following adjectives best describes the concept of art imposed by the triumph of Modernism as the author represents it in paragraph 2

A．Objective.
B．Mechanical.
C．Superficial.
D．Paradoxical.

单项选择题

How did the nineteenth-century defenders of photography stress the photography

A．They stressed photography was a means of making people happy.
B．It was art for recording the world.
C．It was a device for observing the world impartially.
D．It was an art comparable to painting.