公有制为主体、多种所有制经济共同发展是我国社会主义初级阶段的基本经济制度，其中对“公有制为主体”的正确理解是（）
A、公有制经济起主导作用
B、公有制经济成分在所有领域必须占50%以上
C、公有资产仅限在混合所有制经济中占优势
D、公有资产在社会总资产中占优势，国有经济控制国民经济命脉
参考答案：A
解析：A选项观点正确且符合题意，题中公有制为主体，说明公有制经济起主导作用，故选A。B选项观点错误，公有制经济成分并不是在所有领域都必须占半数以上，故排除。C选项观点与题意不符，公有资产占优势，并不是在混合所有制经济中占优势，故排除。D选项观点与题意不符，公有制为主体，公有资产在社会总资产中占优势，但并不包括国有经济控制国民经济命脉，故排除。
| 阅读理解。 |
| Do you have to carry a heavy bag to school? Does it make your back (背部) hurt? Well, students at a high school in Kansas (堪萨斯州), America, have a meeting with their city's mayor to complain (抱怨) about their heavy bags. They say their bags are giving them headaches, and making their necks (脖子) and backs hurt. The mayor says he is very sorry. He says students may do more of their homework on the Internet (国际互联网) to give their backs a rest. |
| 1. A heavy bag may make students . |
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| A. headache B. earache C. toothache D. A, B and C |
| 2. Kansas is in . |
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| A. China B. America C. Australia D. Canada |
| 3. The students talk about their heavy bags to . |
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| A. the mayor B. their parents C. their teachers D. their friends |
| 4. "Mayor" in Chinese means . |
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| A. 校长 B. 队长 C. 市长 D. 省长 |
| 5. The mayor says . |
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| A. he has a headache B. he wants the students to do more homework C. he is sorry D. he has to work hard |