单项选择题

A．Agriculture.
B．Transport system.
C．Industry.
D．National economy.
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S1. Teaching is a highly-complex occupation because________.
单项选择题
A．The ticket cost nothing, so he shouldn’t worry.B．The man can buy the ticket of her roommate.C．The man needn’t pay anything since her roommate decided to pull out of going.D．She will sell her ticket to her roommate.
A．The ticket cost nothing, so he shouldn’t worry.
B．The man can buy the ticket of her roommate.
C．The man needn’t pay anything since her roommate decided to pull out of going.
D．She will sell her ticket to her roommate.
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