大家有没有觉得SAS Adv Guide的练习题有些问题

SAS Adv新手一枚， 刚看了三章书，感觉练习题有些问题看了答案，发现答案和习题选项对不上。
比如第一章的第2题，第7题，
2. How many statements does the program below contain?
proc sql;
select grapes,oranges,
grapes + oranges as sumsales
from certadv.produce
order by sumsales;
quit;
a. two
b. three
c. four
d. five
答案选A，我认为应该选B。
7. What happens if you use a GROUP BY clause in a PROC SQL step without a
summary function?
a. The step does not execute.
b. The first numeric column is summed by default.
c. The GROUP BY clause is changed to an ORDER BY clause.
d. The step executes but does not group or sort data.
答案选A，我认为应该选C

第二章的第5题。
5. Which of the following displays the structure of a table in the SAS log?
a. proc sql;
describe as
select *
from certadv.payrollmaster;
quit;
b. proc sql;
describe contents certadv.payrollmaster;
quit;
c. proc sql;
describe table certadv.payrollmaster;
quit;
d. proc sql;
describe * from certadv.payrollmaster;
quit;
答案选B，我认为应该选C

麻烦各位大神帮我看看，是我自己理解有误，还是答案选项错误。

第一章 第二题：  the PROC SQL statement and the SELECT statement.  only two statements

感觉第一章的第7 题应该是C