设有关系模式S(A，B，C，D)，则SQL语句“SELECT A，C FROM S”能够完成的关系运算足选择和【8】。
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Questions 11 to 18 are based on the passage you have just heard.
A. Better.
B. Sick.
C. Fine.
D. Tired.
Questions 11 to 18 are based on the passage you have just heard.
A. It is the only book for her philosophy class.
B. All the classes have a lot of reading.
C. She just has to read for her philosophy class.
D. Only the philosophy class has a lot of reading.
Questions 11 to 18 are based on the passage you have just heard.
A. If Phil is lucky, he might get a scholarship.
B. There is no way in which Phil can win a scholarship.
C. Phil is not going to chance his luck and try for a scholarship.
D. Phil is not being given a chance to get a scholarship.
Questions 11 to 18 are based on the passage you have just heard.
A. Jack was expected to pass the exam.
B. Jack surprised everybody by taking his exam again.
C. No one really expected Jack to pass exams.
D. Jack wasn’t expected to fail his exams again.
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