单项选择题

A．Boston schools.
B．Frontier life.
C．Teaching requirements.
D．Immigration patterns.
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单项选择题
A．It was easy to ship from England.B．Horses occasionally ate it if there was no grain available.C．People took it with them when they traveled.D．It was easy to prepare over an open fire in the forests.
A．It was easy to ship from England.
B．Horses occasionally ate it if there was no grain available.
C．People took it with them when they traveled.
D．It was easy to prepare over an open fire in the forests.
单项选择题
Several tourism companies believe space travel is going to be a new profitable industry.
A．Y
B．N
C．NG
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