公 * * 品具有何种性质？（）
A.非竞争性
B.非排他性
C.MRSs之和等于MRT
D.都对
参考答案：D
所给单词的正确形式填空。
1. My brother __________ ( have ) a baseball bat .
2. They have many __________(club) .
3. —Let 's watch TV.
—That __________( sound) interesting .
4. She __________ a great collection . ( not have )
5. Does Jim __________ a ping-pong ball ? (have )
