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问题 填空题

如图所示，放在马蹄形磁铁两极之间的导体棒ab，当通有自b到a的电流时受到向右的安培力作用，则磁铁的上端是________极.

答案

N

根据左右定则，可得磁铁的上端为N极，

填空题

你知道“M”品牌吗？以M为品牌标志的麦当劳是餐饮行业的世界第一品牌，是世界500强企业，1955年诞生至今已发展成为在世界范围内拥有30000家分店（中国开设了800家）的跨国公司。在美国《商业周刊》全球最有价值100个品牌中，麦当劳以250亿美元名列第二位，也成了我国大多数青少年喜爱的洋快餐。

（1）什么是跨国公司？

（2）跨国公司为什么要从事全球化经营？

（3）跨国公司在经济全球化过程中起什么作用？
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单项选择题

The first time I remember noticing the crossing guard was when he waved to me as I drove my son to school. He (31) me with a puzzle-all because he waved to me like someone does on seeing a close friend. A big, (32) smile accompanied his wave. For the next few days I tried tO study his face to see if I knew him. I didn’t. Perhaps he had (33) me for someone else. By the time I contented myself with the conclusion that he and I were strangers, we were greeting each other warmly every morning like old friends.

Then one day the (34) was solved. As I approached the school he was standing in the middle of the road (35) his stop sign. I was in live behind four cars. Once the kids had reached the safety of the sidewalk, he lowered his sign and let the cars (36) . To the first he waved and smiled in just the same way he had done to me over the last few days. The kids already had the window down and were happily waving their reply. The second car got the same (37) from the crossing guard, and the driver, a stiff-looking businessman, gave a brief, almost awkward wave back. Each following car of kids on their way to school (38) more heartily.

Every morning I continued to watch the man with interest. So far I haven’t seen anyone (39) to wave back. I find it interesting that one person can make such a difference to so many people’s lives by doing one simple thing like waving and smiling warmly. His (40) armed the start of my day. With a friendly wave and smiling fade he had changed the feelings of the whole neighbourhood.

33（）。

A. praised

B. blamed

C. mistaken

D. respected
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