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【单选题】
$\lim_{x\to -\infty } \, \frac{e^x-e^{-x}}{e^x+e^{-x}}$
A.
1
B.
-1
C.
0
D.
$+\infty$
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参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】Through the group discussion between ______ , we figured out the differences between adolescence and adulthood.
A.
Abbas, Zuowan and Jialin
B.
Billy, Xuanhui and Jialin
C.
Abbas, Xuanhui and Jialin
D.
Billy, Xuanhui and Zixiao
【单选题】In the main part of Text A, ______ showed us some opinions on the relationship between musical experiences and intelligence.
A.
Kamlesh
B.
Jason
C.
John
D.
Abbas
【单选题】What's the time complexity for searching in a B-tree of order 4 and size n?在存储了n个元素的4阶B树中查找，单个节点进行一次查找的时间复杂度为：
A.
O(1)
B.
O(lgn)
C.
O(n)
D.
O(nlgn)
【单选题】下面说法正确的是
A.
FileWriter类是Writer类的子类
B.
FileWriter类是OutputStreamWriter类的子类
C.
FileWriter类是FileOutputStream类的子类
D.
Wirter类是OutputStreamWriter类的子类
【单选题】How many children are there for each node in a B-tree of order 4?4阶B树中每个节点的分支数为：
A.
1~4
B.
2~5
C.
2~4
D.
3~5
【单选题】During the conversation between Billy, Yuege and Yunpeng, we took a brief look at ______ .
A.
brain development
B.
brain degradation
C.
human evolution
D.
human degeneration
【单选题】口袋中有5个球，编号为1,2,3,4,5。从中任取3个，以X表示取出的3个球的最大号码。则P(X=4)=()
A.
1/10
B.
3/10
C.
5/10
D.
7/10
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