单项选择题

A．It could help people of all ages to avoid cancer.
B．It was mainly meant for cancer patients.
C．It might appeal more to viewers over 40.
D．It was frequently interrupted by commercials.
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单项选择题
The basic difference between happy and unhappy people lies in the fact that ______.
A．they focus on different aspects of their life
B．they have different attitudes towards other people
C．they have different personalities
D．they come from different family backgrounds
单项选择题
According to the passage, when did Canada’s baby boom begin
A．In the decade after 1911.
B．After 1945.
C．During the depression of the 1930s.
D．In 1966.
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