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【单选题】
4个8相加是多少？错误的列式是 [ ]A.
8+8+8+8
B.
4+8
C.
8×4
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反馈参考答案：
举一反三
【简答题】已知矩阵A＝ (k≠0)的一个特征向量为α＝ ，A的逆矩阵A －1 对应的变换将点(3，1)变为点(1，1)．求实数a，k的值．
【单选题】If nothing is done to protect the environment, millions of spiders that are alive today will have become ________.
A.
deteriorated
B.
degenerated
C.
suppressed
D.
extinct
【单选题】If nothing is done to protect the environment, millions of spedes that are alive today will have become ________ .
A.
deteriorated
B.
degenerated
C.
suppressed
D.
extinct
【单选题】If nothing is done to protect the environment, millions of species that are alive today will have become _____.
A.
deteriorated
B.
degenerated
C.
suppressed
D.
extinct
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