单项选择题

A．Our brain contract as we grow old.
B．One part of the brain does not contract.
C．Sixty-year olds have better brains than thirty-year olds.
D．Some people’’s brains have contracted earlier than other people’’s.
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单项选择题
The writer believes that Americans do not learn foreign languages largely because they are lazy.
A．Y
B．N
C．NG
单项选择题
What do scientists say about the collision of an asteroid with Earth
A．It is very unlikely but the danger exists.
B．Such a collision might occur once every 25 years.
C．Collisions of smaller asteroids with Earth occur more often than expected.
D．It’’s still too early to say whether such a collision might occur.
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