填空题

S7

【参考答案】

unless—if

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单项选择题

A．Because they are cheaper.B．Because they are adaptable to industrial use.C．Because they are not easily burned and can last longer.D．Because marble adds artistic value to ancient buildings.

A．Because they are cheaper.
B．Because they are adaptable to industrial use.
C．Because they are not easily burned and can last longer.
D．Because marble adds artistic value to ancient buildings.

单项选择题

A．Four.B．Five.C．Six.D．Seven.

A．Four.
B．Five.
C．Six.
D．Seven.

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