问题
选择题
与太阳活动无关的现象是
A．极光
B．极昼极夜
C．地面短波通信中断
D．地球磁场受到干扰
答案
答案：B
题目分析：太阳活动对地球的影响：使无线电短波通信产生中断、地球磁场受到干扰、出现极光现象、对地球气候的影响等。正确答案选B。
点评：本题难度较小。要求学生熟练掌握太阳活动对地球的影响。
搜题请搜索小程序“爱下问搜题”
与太阳活动无关的现象是
A．极光
B．极昼极夜
C．地面短波通信中断
D．地球磁场受到干扰
答案：B
题目分析：太阳活动对地球的影响：使无线电短波通信产生中断、地球磁场受到干扰、出现极光现象、对地球气候的影响等。正确答案选B。
点评：本题难度较小。要求学生熟练掌握太阳活动对地球的影响。
that there would not be a tree for him because we didn’t have enough money. However, it didn’t matter to him. All he talked about was how much he wanted to make other children smile. So he decided that what he wanted to do was earn money to buy Christmas cards and send them to other children from poor families. My son went out daily and raked (耙) leaves and walked some dogs to make money. Not only did he buy car
ds, but he also made enough money to buy all the stamps and lollipops (棒棒糖) to be sent with the cards. He sent out about 100 cards. Doing this brought him that same smile and sparkle in his eyes as did the birthday cards that he received.