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【单选题】
设向量α=α1+α2+…+αs(s>1)，而β1=α-α1，β2=α-α2，…，βs=α-αs，则( )．A.
r(α1，α2，…，αs)=r(β1，β2，…，βs)
B.
r(α1，α2，…，αs)>r(β1，β2，…，βs)
C.
r(α1，α2，…，αs)1，β2，…，βs)
D.
不能确定两者之间的大小关系
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【单选题】It is evident that children shall not be criticized too much, because many experts believe it will ____ their confidence and self-respect.
A.
undercharge
B.
undercut
C.
undermine
D.
undertake
【单选题】Many experts believe that this country’s economy is on the of collapse.
A.
edge
B.
limit
C.
part
D.
place
【多选题】关于正当防卫，下列表述中，正确的是：
A.
正当防卫的起因条件是有不法侵害行为发生
B.
正当防卫的时间条件是不法侵害行为即将发生或者正在进行。特殊情况下，对已经结束的侵害也可正当防卫
C.
防卫的目的是为了保护合法权利免受不法侵害
D.
正当防卫与防卫过当区别的关键在于是否明显超过必要限度造成重大损害
【单选题】para.2 And many experts believe our pushover parenting is doing more harm than good. which one best translates the underlined part into Chinese?
A.
容易被说服的养育
B.
唾手可得的养育
C.
好好先生式的教养之道
【单选题】I am a very persistent salesman. I work with customers for as long as it takes for them to buy something.
A.
stubborn
B.
useless
C.
late
D.
chronic
【多选题】关于正当防卫,下列表述中,正确的是( )
A.
正当防卫的起因条件是有不法侵害行为发生
B.
正当防卫的时间条件是不法侵害行为即将发生或者正在进行。特殊情况下，对已经结束的侵害也可以正当防卫
C.
防卫的目的是为了保护合法权利免受不法侵害
D.
正当防卫与防卫过当区别的关键在于是否明显超过必要限度造成重大损害
【单选题】Many experts believe that teachers’ development is _____ the key to better education lies.
A.
that
B.
what
C.
where
D.
which
【单选题】______ no conclusive evidence exists, many experts believe that the wheel was invented only once and then diffused to the rest of the world.
A.
Even
B.
But
C.
Although
D.
So
【简答题】W hy do many experts believe that dreams can be used to recognize inner conflicts?
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