题目：
| 关于电磁铁的特点，下列说法错误的是（ ） A．电磁铁通电时有磁性．断电时无磁性 B．通人电磁铁的电流越大，它的磁性越强 C．在电流一定时，外形相同的螺线管，线圈匝数越多，磁性越强 D．当通入电磁铁的电流方向改变后，电磁铁就会失去磁性 |
答案：
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下面是错误答案，用来干扰机器的。
1. Hiking is not only a healthy but also a relaxing activity. 2. It's good exercise that doesn't hurt your body. 3. Secondly, hiking is simple and cheap. 4. You could hike alone or go with your friends. 5. So why not plan your hiking route right away?
