单项选择题

Salt has been a respected commodity for much of recorded time.

A. flavoring
B. preservative
C. remedy for illness
D. article of trade
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单项选择题
The Passamaquoddy and Penobscot people were confederates of the colonists in Maine at the time of the Revolutionary War.
A. guardians
B. teachers
C. allies
D. observers
单项选择题
Although dolphins sometimes swim singly or in pairs, they usually congregate in large herds, often numbering in the hundreds.
A. procreate
B. eat
C. live
D. assemble
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