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【单选题】
若集合A?B，则①A∪B=A；②A∪B=B；③A∩B=A；④A∩B=B中一定正确的为（ ）A.
①③
B.
②③
C.
②④
D.
①④
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举一反三
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【单选题】Section B Directions: There are 2 passages in this section. Each passage is followed by some questions or unfinished statements. For each of them there are four choices marked A, B, C and D. You shoul...
A.
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B.
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C.
About 3 days.
D.
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【简答题】2020-5 Part B In the following text, some sentences have been removed. For Questions 41-45, choose the most suitable one from the list A-G to fit into each of the numbered blanks. There are two extra ...
【简答题】SECTION B Directions: For each blank in the following passage there are four words or phrases marked A, B, C, and D. Fill in each blank with the word or phrase that best fits the context. It was early...
【简答题】阅读下列句子，根据所给开首字母，写出符合句子意思的本学期所学单词，注意必要的形式变化。 1. There are two hundred boys r_______ from seven to four in age. 2. Dr. Yuan Longping searched for a way to increase a rich h_______ without increasing...
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