问几道SAS选择题！求高手解答！很简单的对你们来说-经管之家官网！

19. Which one of the following statements is true when SAS encounters a data error?
A. The execution phase is stopped, and a system abend occurs.
B. A missing value is assigned to the appropriate variable, and execution continues.
C. The execution phase is stopped, and a SAS data set is created with zero observations.
D. A missing value is assigned to the appropriate variable, and execution stops at that point.
35. Which TITLE statement would display JANE'S DOG as the text of the title?
A. title "JANE"S DOG";
B. title 'JANE"S DOG';
C. title "JANE'S DOG";
D. title 'JANE' ' 'S DOG';
41. Which one of the following permanently associates a format with a variable?
A. the FORMAT procedure
B. a FORMAT statement in a DATA step
C. an INPUT function with format modifiers
D. an INPUT statement with formatted style input
49. An HTML file contains a SAS report.
Which one of the following ODS statement options specifies the name of the HTML file?
A. OUT=
B. FILE=
C. HTML=
D. HTMLFILE=
50. The following SAS program is submitted:
proc contents data = sasuser._all_ nods;
run;
Which one of the following is produced as output?
A. the list of all data set names in the SASUSER library only
B. the descriptor portion of the data set named SASUSER._ALL_ only
C. the descriptor portion of every data set in the SASUSER library only
D. the list of data set names in the SASUSER library plus the descriptor portion of every data set in
the SASUSER library
如果可以的话请简单解释下，在此谢过各位