设集合A＝｛1，2，a，b｝，B＝｛2，4，c，d｝，已知A ∪ B＝｛1，2，3，4，5，6｝，A ∩ B＝｛2，4)，A－B＝｛1，3｝，那么a，b，c，d可以是[ ]．
A. a＝3，b＝5，C＝1，d＝5
B. a＝5，b＝6，C＝3，d＝5
C. a＝4，b＝5，C＝3，d＝6
D. a＝3，b＝4，C＝5，d＝6
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According to the professor, what does the term balletti mean？
A dramatic story
B. A parade of horses
C. A dance done in figures
D. An outdoor entertainment
What did the man do wrong？
A. He did not finish the test within the time limit.
B. He did not study enough before the test.
C. He did not answer one question completely.
D. He did not understand a major concept.
The word exhausted in paragraph 3 is closest in meaning to
A. increased
B. used
C. resupplied
D. wasted
What does the woman agree to do？
A. Join the club
B. Eat at a restaurant
C. Go to a meeting
D. Study with the man
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