单项选择题

The carriers’ participation in the system is determined by （）.

A．the US federal government
B．mobile phone users
C．the carriers themselves
D．the law of the United States

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单项选择题

Who was supposed to be the first owner of the book（）

A．An official of the UN.
B．A coffee shop owner.
C．A friend of the author’s.
D．Alex’s friend from Californi

单项选择题

59（）

A. when did you get back
B. What a surprise I got
C. How I admire you
D. I am Tom
E. got hold of
F. got through
G. this is Tom
H. tried to contact you