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Questions 19 to 21 are based on the conversation yon have just heard.

A. It may not pay well.
B. It may not come on time.
C. It may not take your goods.
D. It may charge the quote.

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Questions 26 to 28 are based on the passage you have just heard.

A. Solar energy.
B. Synthetic fuel.
C. Alcohol fuel.
D. Electricity power.

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Questions 29 to 31 are based on the passage you have just heard.

A. He feels funny.
B. He feels angry.
C. He feels excited.
D. He feels sad.

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阅读下列说明和C++程序，将应填入(n)处的字句写在对应栏内。【程序1说明】程序1中定义了数组的类模板，该模板使得对于任意类型的二维数组，可以在访问数组元素的同时，对行下标和列下标进行越界判断，并给出相应的提示信息(C++语言本身不提供对下标越界的判断)。【程序1】#include ＜ iostream. h ＞template ＜ class T ＞ class Array2D;template ＜ class T ＞ class Array2DBody {friend (1) ; T * tempBody; int iRows, iColumns, iCurrentRow; Array2DBody(int Rows,int Cols) { tempBody = (2) ; iRows = Rows; iColumns = Cols; iCurrentRow = -1; }public: T& operator[ ] (int j){ bool row_ error, column_ error; row_ error = column_ error = false; try { if ( iCurrentRow ＜ 0｜｜iCurrentRow ＞ = iRows) row_ error = true; if( j ＜ 0｜｜j ＞ = iColumns) column_error = true; if( row_error = = true [ [ column_ error = = true) (3) ; } catch(char) { if (row_error = = true) cerr ＜＜ "行下标越界"[" ＜＜ iCurrentRow ＜＜ "]"; if( colmnn_error = = true) cerr＜＜"列下标越界[" ＜＜j＜＜"]"; cout ＜＜ "\n"; } return tempBody[ iCurrentRow * iColumns + j ]; } ~ Array2 DBody ( ) { delete [ ] tempBody; } }; template ＜ class T ＞ class Array2D { Array2DBody ＜ T ＞ tBody; public: Array2DBody ＜ T ＞ & operalor[ ] (int i) { tBody, iCurreutRow = i; (4) ; Array2D(int Rows,int Cols): (5) {} };void main( ){ Array2D ＜int＞ al ( 10,20 ); Array2D ＜double＞ a2(3,5); int bl; double b2; b1=a1[-5][10]；//有越界提示：行下标越界[-5] b1=a1[10][15]；//有越界提示：行下标越界[10] b1=a1[1][4]；//没有越界提示 b2=a2[2][6]；//有越界提示：列下标越界[6] b2=a2[10][20]；//有越界提示：行下标越界[10]列下标越界[20] b2=a2[1][4]；//没有越界提示}

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Questions 19 to 21 are based on the conversation yon have just heard.

A. Give them to the second and third year students for free.
B. Sell them to the second-hand bookshop.
C. Advertise them in the student newspaper for sale.
D. Advertise them on the university notice boards.

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Questions 19 to 21 are based on the conversation yon have just heard.

A. It may not pay well. B. It may not come on time. C. It may not take your goods. D. It may charge the quote.

Questions 26 to 28 are based on the passage you have just heard.

Questions 29 to 31 are based on the passage you have just heard.

Questions 19 to 21 are based on the conversation yon have just heard.

A. It may not pay well.
B. It may not come on time.
C. It may not take your goods.
D. It may charge the quote.