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【简答题】
使用运算符测试集合包含集合A是否为集合B的真子集的表达式可以写作_______。
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举一反三
【单选题】He ran into a passing car duo to _______ .
A.
he ran too fast
B.
he ran from the roadside
C.
his running too fast
D.
him to run from the roadside
【简答题】已知数列{a n }中，a 1 =2，a n+1 =4a n ﹣3n+1，n∈N*，已知数列b n =a n ﹣n，证明：数列{b n }是等比数列．
【单选题】已知数列{a n }满足a n =2 2n-1 ，则（ ）
A.
数列{a n }是公比为2的等比数列
B.
数列{a n }是公比为4的等比数列
C.
数列{a n }是公差为2的等差数列
D.
数列{a n }是公差为4的等差数列
【单选题】The question “How fast did he drive when he ran the red light?"_____ He ran the red light",。
A.
presupposes
B.
entails
C.
contradicts
D.
includes
【单选题】When he explained it again and again, the students' patience______.
A.
ran over
B.
ran on
C.
ran out
D.
ran off
【简答题】已知S n 为等比数列{a n }的前n项和，a 1 =2，若数列{1+a n }也是等比数列，则S n 等于（ ） A．2n B．3n C．2 n+1 -2 D．3 n -1
【简答题】He ______ (惊慌) and ran as fast as he could.
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