单项选择题
Which of the following words contains one bound morpheme
A．Disappearance.
B．Untouchable.
C．Desirablity.
D．Physician.
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单项选择题
According to this passage, Environmental Protection Agency ______.
A．is the only agency studying the effects of air pollution on health
B．has launched a surprised attack on researchers
C．has decided to decrease the permitted concentration of airborne dust
D．has tremendously improved pollution control
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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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