单项选择题

We are told that adders are ______.

A．normally friendly towards people
B．unlikely to bite except in self-defense
C．aggressive towards anyone in their territory
D．not afraid of human beings

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单项选择题

According to the passage, which of the following is NOT true of women in pattern III families

A．They earn a reliable and comparatively high income.
B．They continue to work solely to meet the urgent needs of their family.
C．They enjoy the fellowship involved in working with other women.
D．They serve as models of behavior for others in the region.

单项选择题

From the passage we can find out that the author mainly studies ______.

A．patterns of family behavior
B．women who are initiating social change in a small region in Texas
C．migrant agricultural workers
D．how migrant farm workers lived in the past