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.
单项选择题
A．He will get paid in four weeks. B．The book bag is too expensive. C．He can’t lend the woman any money. D．The woman doesn’t need a new book bag.
A．He will get paid in four weeks.
B．The book bag is too expensive.
C．He can’t lend the woman any money.
D．The woman doesn’t need a new book bag.
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