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【单选题】
在100个产品中，一等品20个，二等品30个，三等品50个，用分层抽样的方法抽取一个容量20的样本，则二等品中A被抽取到的概率为（ ）A.
1 5
B.
3 10
C.
2 3
D.
不确定
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举一反三
【简答题】The new start-up company _________ a large chunk of the market within a year. carved out carved into carved up carved out of
【单选题】The heads of which Presidents are carved into Mount Rushmore?
A.
Washington, Madison, Theodore Roosevelt, Kennedy
B.
Washington, Lincoln, Nixon, Reagan
C.
Adams, Taft, Eisenhower, Carter
D.
Washington, Jefferson, Theodore Roosevelt, Lincoln
【简答题】You are asked to do it after school.
【单选题】—Excuse me, is this your backpack? —_____ [ ]
A.
Sorry, I don't know
B.
Yes, it is. Thank you
C.
Your backpack is in my room
D.
It's black
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