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【单选题】
PART C Directions: You will hear three dialogues or monologues. Before listening to each one, you will have 5 seconds to read each of the questions which accompany it. While listening, answer each question by choosing A, B, C or D. After listening, you will have 10 seconds to check your answer to each question. You will hear each piece ONLY ONCE. 听力原文: Poe was born in Boston in 1809. He attended the University of Virginia, where he was a distinguished student and developed his lifelong taste for liquor. Afterward, he enlisted in the U. S. Army and rose to the rank of sergeant major. He was expelled from West Point after a year, loosing his hopes of becoming a career officer. Poe started publishing his poetry and stories in the early 1830s and pursued a career in journalism to ensure some sort of financial security. In 1843, he published several works, including The Tell-Tale Heart and The Gold Bug which won a $100 prize in a contest sponsored by the Philadelphia Dollar Newspaper. The story made Poe famous with the fiction reading public. His poem 'The Raven' which appeared in the New York Evening Mirror in January 1845, was a critical and commercial success. Along with 'To Helen' and 'Annabel Lee', 'The Raven' is considered one of Poe's finest poems. The Fall of the House of Usher and The Murders in the Rue Morgue are arguably two of his best short stories. But both Poe and his wile Virginia's poor health kept the pair in financial and emotional distress. Poe died in 1849. When did Poe start publishing his poetry and stories and pursue a career in journalism?
A.
In the early 1810s.
B.
In the early 1820s.
C.
In the early 1830s.
D.
In the early 1840s.
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举一反三
【单选题】若AX=65ACH,BX=0B79EH,则()
A.
执行ADD AX,BX指令后,CF=1,OF=1
B.
执行SUB AX,BX指令后,SF=1,OF=0
C.
执行TEST BX,AX指令后,CF=0,OF=0
D.
执行XOR AX,BX指令后,PF=1,IF=0
【单选题】若( AX )= 65ACH ,( BX )= 0B79EH ,则 。
A.
执行 ADD AX , BX 指令后, CF = 1 , OF = 1
B.
执行 SUB AX , BX 指令后, SF = l , OF = 0
C.
执行 TEST BX , AX 指令后, OF=0 , CF = 0
D.
执行 XOR AX , BX 指令后, PF = 1 , IF = 0
【简答题】设有齐次线性方程组Ax=0与Bx=0,其中A、B均为m×n矩阵,现有4个命题: ①若Ax=0的解均是Bx=0的解,则秩(A)≥秩(B). ②若秩(A)≥秩(B),则Ax=0的解均是Bx=0的解. ③若Ax=0与Bx=0同解,则秩(A)=秩(B). ④若秩(A)=秩(B),则Ax=0与Bx=0同解. 以上命题中正确的是 (A)①②.    (B)①③.    (C)②④.    (D)③④.    ...
【简答题】是借助直觉和潜意识活动而实现的认知和创造。
【单选题】IP地址192.168.77.159和192.168.66.252进行路由聚合,则汇总后的路由表示为( )。
A.
192.168.64/16
B.
192.168.64/18
C.
192.168.64/20
D.
192.168.64/24
【单选题】若AX=1020H,BX=1200H,CF=1,则SM11193QB AX,BX的执行结果为( )。
A.
0EFlFH
B.
0FEFFH
C.
0FElFH
D.
0FE21H
【单选题】对于一元二次方程ax 2 +bx+c=O(a≠0),下列说法: ①若a+c=0,方程ax 2 +bx+c=O必有实数根; ②若b 2 +4ac<0,则方程ax 2 +bx+c=O一定有实数根; ③若a-b+c=0,则方程ax 2 +bx+c=O一定有两个不等实数根; ④若方程ax 2 +bx+c=O有两个实数根,则方程cx 2 +bx+a=0一定有两个实数根. 其中正确的是(  )
A.
①②
B.
①③
C.
②③
D.
①③④
【简答题】若AX=5555H,BX=FF00H,试问在下列程序段执行后,AX=?BX=?CF=? AND AX,BX XOR AX,AX NOT BX
【单选题】若a>0,b>0,c<o,则下列方程中必有两个实数根的方程是(  )
A.
ax 2 -bx-c=0
B.
ax 2 +bx-c=0
C.
ax 2 +bx+c=0
D.
以上答案都不对
【多选题】为撤离与社区自治社区工作者需要做的准备包括( )
A.
形成居民间的良好人际关系
B.
帮助居民建立互助支持网络
C.
发展居民组织
D.
培养社区领袖
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