单项选择题

According to the news, the American space shuttle Columbia failed

A．on Jan. 3rd.
B．on Feb. 1st.
C．on Mar. 4th.
D．on Jan. 2n
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单项选择题
What kind of people is more likely to develop, or suffer from, Alzheimer's
A．People who are older than 65.
B．People who are physically weak.
C．People who consume saturated fat.
D．People who consume ordinary oil.
单项选择题
How many old people have been examined for the research
A．815.
B．855.
C．831.
D．865.
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