单项选择题

A．Orlon.
B．Artificial silk
C．Linen.
D．Fur.
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单项选择题
A．They show fear.B．They reach out.C．They start to cry.D．They turn to adults.
A．They show fear.
B．They reach out.
C．They start to cry.
D．They turn to adults.
填空题
S1. The Open University in Britain encourages the students to study at home by a method of______.
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