单项选择题

A．How grasshoppers find food.
B．How grasshoppers fight other insects.
C．How grasshoppers communicate with each other.
D．How grasshoppers escape from danger.
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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.
填空题
S1. Teaching is a highly-complex occupation because________.
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