填空题

S3. When the students doing seatwork, teach ers usually (1)________or(2)________.

【参考答案】

(1)answer questions(2)sit at their own desks and correct stu......

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