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【单选题】
在一所规模较大的重点大学中，全体注册学生的年龄分布未知，但在一个400名学生的简单随机样本中，发现200人年龄超过20岁，下列判断正确的是（）A.
全体注册学生中约50%超过20岁，但可能偏离少许百分点
B.
恰好全体注册学生的50%超过20岁
C.
全体注册学生中约50%超过20岁，但可能偏离10或20个百分点
D.
无法判断
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举一反三
【单选题】Had you come five minutes earlier, you () the train to Birmingham. But now you missed it.
A.
would catch
B.
would have caught
C.
could catch
D.
should catch
【单选题】Five minutes earlier, ______ we could have caught the last train.
A.
and
B.
but
C.
or
D.
so
【单选题】Five minutes earlier, ______ we wouldn't have missed the last bus.
A.
or
B.
and
C.
but
D.
so
【单选题】Had I got there five minutes earlier, I could () her.
A.
meet
B.
meeting
C.
have met
D.
to meet
【单选题】Five minutes earlier, I the flight.
A.
have caught
B.
had caught
C.
could have caught
D.
were to catch
【简答题】If you ______ (arrive)five minutes earlier．you could have caught the bus．
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【单选题】Had I got there five minutes earlier, I could () her.
A.
meet
B.
meeting
C.
have met
D.
to meet