单项选择题
In 1950 Roberto was four times as old as Juan. In 1955 Roberto was three times as old as Juan. How old was Roberto when Juan was born （）
A. 5
B. 10
C. 20
D. 30
E. 40
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单项选择题
LIMERICK : POEM ::
A． motif : symphony
B． prologue : play
C． catch : song
D． sequence : sonnet
E． epigraph : novel
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单项选择题
Let P and Q be points which are two inches apart, and let A be the area, in square inches, of a circle which passes through P and Q. Which of the following is the set of all possible values for A （）
A. 0＜A
B. 0＜A ≤π
C. A=π
D. A＞π
E. A ≥π
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