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【单选题】
已知向量 满足： 与 垂直，且 ，则 的夹角为（ ）A.
B.
C.
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皮皮学刷刷变学霸
举一反三
【单选题】Jack London was at his height of his powers when he wrote ___, which is deeply influenced by Darwinism.
A.
The Sea Wolf
B.
Martin Eden
C.
The Call of the Wild
D.
White Fang
【单选题】Jack London was at his height of his powers when he wrote______, which is deeply influenced by Darwinism.
A.
The Sea Wolf
B.
To Build a Fire
C.
The Call of the Wild
D.
Martin Eton
【单选题】以下程序的输出结果是 using System; namespace aaa { class Example1 { static void Main() { int i; int [] a=new int[10]; for(i=9;i>=0;i--) a[i]=10-i; Console.WriteLine("{0},{1},{2}",a[2],a[5],a[8]); } } }
A.
2，5，8
B.
7，4，1
C.
8，5，2
D.
3，6，9
【单选题】Jack was praised by his teacher because he had made _______.
A.
great progress
B.
great progresses
C.
a great progress
D.
little progress
【单选题】下列属于文件输入输出类的是
A.
FileInputStream 和 FileOutputStream
B.
BufferInputStream 和 BufferOutputStream
C.
PipedInputStream 和 PipedOutputStream
D.
以上都是
【单选题】Jack was ____by his mother's rude behaviour.
A.
irritated
B.
unhappy
C.
unkind
D.
surprised
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