单项选择题

A seed planted in the sensitive lining of an oyster begins a perpetual coating process that forms a pearl.

A. total
B. annual
C. continual
D. habitual
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单项选择题
The anhinga is a black water bird that frequents the perimeters of the everglades.
A. waters
B. swamps
C. forests
D. edges
单项选择题
Through her portrayal of eight college-educated women in the book, The Group, author Mary McCarthy criticizes an entire period.
A. age
B. nation
C. social class
D. system of education
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