问题
选择题
| 关于磁感线，下列说法中正确的是（ ） |
| A．磁感线的方向总是从N极到S极 B．磁感线是真实的曲线，磁场由磁感线组成 C．磁场中任一点磁感线方向跟放在该点的磁针静止时N极指向一致 D．有磁感线处有磁场，没有画磁感线处无磁场 |
答案
答案：C
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| 关于磁感线，下列说法中正确的是（ ） |
| A．磁感线的方向总是从N极到S极 B．磁感线是真实的曲线，磁场由磁感线组成 C．磁场中任一点磁感线方向跟放在该点的磁针静止时N极指向一致 D．有磁感线处有磁场，没有画磁感线处无磁场 |
答案：C
阅读短文，从文后所给A—F六个句子中选出填入文中空缺处，使短文完整正确。 If you have a brother or sister, you already know you are different from each other．You live together in the same house and have the same parents．小题1:________ Why is this? One possible reason is the way your parents treat you． First-born children receive all the attention from their parents． Most families have twice as many photos of a first-born as any other child． Parents tend to give them more responsibility．小题2:_______ As a result, first-borns are often responsible, hard-working and serious． They often want to do well at school and work小题3:_______ For example, George W. Bush, George Washington, and Lyndon Baines Johnson are all first-borns． When a second child arrives, parents are more relaxed． The second child is allowed to be more independent． But he also has to compete with the first-born for the parents’ attention and love． These children often choose different sports and hobbies to show independence．小题4:______ They are often adventurous, fun-loving, and outgoing, but can be jealous and get angry easily． The youngest child tends to be the happiest． He has fewer responsibilities and more freedom． These children do not feel pressure to do well at school and work, but have to be creative to get their family’s attention．小题5:_______ So, many famous talk-show hosts and comedians were born last．
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