【单选题】
13. A fire broke out at the school but the teacher were able to lead the ___________ children to safety.
①
frightened
②
frightening
③
frighten
④
fright
【单选题】
17. A survey was carried out on the death rate of new-born babies in that region, ____were surprising.
①
as results
②
which results
③
the results of it
④
the results of which
【单选题】
They couldn’t ______ to fly out to see us, and we couldnt either. We were all poor then.
①
offer
②
afford
③
provide
④
supply
【单选题】
Jack, the boss, asked Steven to leave — ____, she was filed.?
①
whats more ?
②
in addition?
③
on the contrary ?
④
D. in other words ?
【单选题】
1. Decide which of the following best states the authors purpose of writing?
①
To express his anguish of movig from his old home
②
To describe the laughter and tears of the four generations of his family
③
to explain the real meaning of his grandpas wordsneversay googbye‘
④
To tell the story of his grandpas death
【单选题】
-Johnson has promised us that he will help ?us out to his best ability.
-I don’t buy it. In my opinion, ?he _______ so kind.
①
has been
②
is
③
was
④
is being
【单选题】
对下面程序描述正确的是（）。#includestdio.h#includestdlib.hvoidmain(){FILE*in,*out;if((in=fopen("file1.txt","a+"))==NULL){printf("cannotopenfile1\n");exit(0);}if((out=fopen("file2.txt","a+"))==NULL){printf("cannotopenfile2\n");exit(0);}while(!feof(out))fputc(fgetc(out),in);fclose(in);fclose(out);}
①
程序实现在屏幕上显示磁盘文件file1.txt的内容
②
程序实现将磁盘文件file2.txt复制到磁盘文件file1.txt
③
程序实现将两个磁盘文件file1.txt和file2.txt的内容合二为一
④
程序实现在屏幕上显示磁盘文件file2.txt的内容
【单选题】
<img class=jc-formula data-tex=行列式\quad \begin{ vmatrix } 2 \begin{ matrix } -4 1 \end{ matrix } \\ 1 \begin{ matrix } -5 3 \end{ matrix } \\ 1 \begin{ matrix } -1 1 \end{ matrix } \end{ vmatrix }\quad = src=https://huaweicloudobs.ahjxjy.cn/FDF28FC6F756F3CD94C74576BA5B9CE9.png style=vertical-align: middle;/>
①
-8
②
8
③
-15
④
15
【判断题】
<img class=jc-formula data-tex=\begin{ vmatrix } 3 \begin{ matrix } 0 0 \end{ matrix } \\ 2 \begin{ matrix } -5 2 \end{ matrix } \\ -7 \begin{ matrix } 2 1 \end{ matrix } \end{ vmatrix }=3\begin{ vmatrix } -5 2 \\ 2 -1 \end{ vmatrix } src=https://huaweicloudobs.ahjxjy.cn/28B8975C0852EE749D3C3C69740C1FC7.png style=vertical-align: middle;/>
①
正确
②
错误
【多选题】
<img class=jc-formula data-tex=矩阵A经过初等行变换化为B=\left( \begin{ matrix } 1 1 \begin{ matrix } 0 2 \end{ matrix } \\ 0 0 \begin{ matrix } 1 -1 \end{ matrix } \\ 0 0 \begin{ matrix } 0 0 \end{ matrix } \\ 0 0 \begin{ matrix } 0 0 \end{ matrix } \end{ matrix } \right) ，则B称为 src=https://huaweicloudobs.ahjxjy.cn/42AAD1644BAFF459D86FCDE76CE1937C.png style=vertical-align: middle;/>
①
行阶梯形矩阵
②
行最简形矩阵
③
标准型矩阵
④
以上三种都不是