单项选择题

What would happen if wolves were brought back into the ecological mix（）

A．They would help to spread a fatal disease.
B．They would pose a threat to the children.
C．They would endanger domestic animals.
D．They would eventually kill off the deer.

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单项选择题

A．Go on a diving tour in Europe.B．Add 300 dollars to his budget.C．Travel overseas on his own.D．Join a package tour to Mexico.

A．Go on a diving tour in Europe.
B．Add 300 dollars to his budget.
C．Travel overseas on his own.
D．Join a package tour to Mexico.

单项选择题

（）

A．It was used by the family to hold dinner parties.
B．It is situated at the foot of a beautiful mountain.
C．It was frequently visited by heads of state.
D．It is furnished like one in a royal palace.