单项选择题

A．It is difficult to obtain.
B．Paper cannot be made without it.
C．It causes paper to deteriorate.
D．It prevents wood from being turned into pulp.
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单项选择题
A．Because he looked very unhappy. B．Because he usually wore a hard wing collar. C．Because the fight side of his face was swollen. D．Because the left side of his face was swollen.
A．Because he looked very unhappy.
B．Because he usually wore a hard wing collar.
C．Because the fight side of his face was swollen.
D．Because the left side of his face was swollen.
填空题
O
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