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【单选题】
某大学有三个系，A系有10名教师，B系有20名教师，C系有30名教师，甲是B系主任，如果学校决定采用分层抽样的方法选举6位教师组成“教授联席会”，那么，甲被选中的概率为（ ）A.
B.
C.
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举一反三
【单选题】Some friends tried to settle the quarrel between Mr.and Mrs.Smith without hurting the feeling of______,but failed.
A.
none
B.
either
C.
all
D.
another
【简答题】—We really enjoy ourselves at the party.Thanks again,Mr.and Mrs.White. —___________.Just drop in whenever you feel like it. A．With pleasure B．Our great honor C．Nice having you here D．Nice you are ...
【简答题】Hey, Mr．and Ms．Unluckiness and Unhappiness! Terrorism, the war, the economic cr and unemployment are at your door．Are you afraid of them? Well, don’t be! America is a happy land．The Smiley Face ic...
【简答题】Mr.and Mrs. Gordon were sitting on the sand， reading their magazines． Mr. Gordon was too stingy（吝啬）to rent a chair． Their twelve－year－old daughter，Sandra， was playing at the water's edge． Suddenly a h...
【单选题】This passage is about a ________ day for Mr.and Mrs.Smith.
A.
happy
B.
long
C.
tiring
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