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【简答题】
已知e 1 ，e 2 是两个不共线的向量， AB =e 1 +e 2 ， CB =-λe 1 -8e 2 ， CD =3e 1 -3e 2 ，若A、B、D三点在同一条直线上，求实数λ的值．
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【单选题】The writer suggests that there is no sense in buying the latest volume ______.
A.
because it is not worth the price.
B.
because it has fewer entries than before.
C.
unless one has all the volumes in his collection.
D.
unless an expanded DNB will come out shortly.
【简答题】There is no sense in ______ important decisions ______ inexperienced people． 让没有经验的人做重要决定是没有道理的。
【单选题】There is no sense in ________ important decisions to inexperience people.
A.
owing
B.
leaving
C.
sending
【简答题】There is no sense in ____important decisions ____inexperienced people.
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