在考试前想问一下70题里自己没搞定的几道题，有劳高手啦，谢谢

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29.The following SAS program is sumbitted:

  data WORK.INFO;
     infile 'DATAFILE.TXT';
     input @1 Company $20. @25 State $2. @;
     if State=' ' then input @30 Year;
     else input @30 City Year;
     input NumEmployees;
  run;

How many raw data records are read during each iteration of the DATA step?

     A. 1
     B. 2
     C. 3
     D. 4

Answer: A

为什么是一个呢
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35.given the SAS data set SASDATA.TWO:

  X  Y
  -- --
  5  2
  3  1
  5  6

The following SAS program is submitted:
  data SASUSER.ONE  SASUSER.TWO  OTHER;
     set SASDATA.TWO;
     if X eq 5 then output SASUSER.ONE;
     if Y lt 5 then output SASUSER.TWO;
     output;
  run;

What is the result?

     A.
data set SASUSER.ONE has 5 observations   
data set SASUSER.TWO has 5 observations
data set WORK.OTHER  has 3 observations

     B.
data set SASUSER.ONE has 2 observations   
data set SASUSER.TWO has 2 observations
data set WORK.OTHER  has 1 observations

     C.
data set SASUSER.ONE has 2 observations   
data set SASUSER.TWO has 2 observations
data set WORK.OTHER  has 5 observations

     D. No data sets are output. The DATA step fails execution due to syntax errors.

Answer: A
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42.The following SAS program is submitted:

  data WORK.ONE;
     Text='Australia, US, Denmark';
     Pos=find(Text,'US','i',5);
  run;

What value will SAS assign to Pos?

     A. 0
     B. 1
     C. 2
     D. 12

Answer: D

查询了下find函数还是不太懂
只知道find（string,find-string, modifiers, starting-position)
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44.The following SAS program is submitted:

  data ONE TWO SASUSER.TWO
     set SASUSER.ONE;
  run;

Assuming that SASUSER.ONE exists, how many temporary and permanent SAS data sets are created?

     A. 2 temporary and 1 permanent SAS data sets are created
     B. 3 temporary and 2 permanent SAS data sets are created
     C. 2 temporary and 2 permanent SAS data sets are created
     D. there is an error and no new data sets are created

Answer: D
不明白为什么不是A
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35和44看上去是同一类型，看来这方面不太熟悉