已知（3+2a）2+|b﹣2|=0．则ab=（ ）．
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已知集合A={x|x-2≥0}，集合B={x|x＜3}．
（1）求A∪B；
（2）求A∩B；
（3）求（CRA）∪（CRB）．
Every Monday morning, students in our school would stand at attention, watching the national flag ______. [ ]
A. raising
B. rising
C. being risen
D. being raised
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