单项选择题

If you want to make a cheaper daytime call, you should （）

A．call on Monday
B．ask the operator to pay some money
C．keep waiting
D．phone on a Sunday

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How many hours is Moscow ahead of London during the summer（）

A．2.
B．3.
C．4.
D．5.
单项选择题
When is it cheaper to make an international call（）

A．10a.m.
B．5p.m.
C．11 p.m.
D．11a.m.
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