问题
单项选择题
称为大地震的地震震级应超过或等于( )。
A．8级
B．7级
C．6级
D．5级
答案
参考答案：B
解析：震级是衡量一次地震大小的等级，用符号M表示。一般，M＜2的地震，称为微震；M＝2～4的地震称为有感地震；M＞5的地震，对建筑物就要引起不同程度的破坏，统称为破坏性地震，M＞7的地震称为强烈地震或大地震；M＞8的地震称为特大地震。
搜题请搜索小程序“爱下问搜题”
称为大地震的地震震级应超过或等于( )。
A．8级
B．7级
C．6级
D．5级
参考答案：B
解析：震级是衡量一次地震大小的等级，用符号M表示。一般，M＜2的地震，称为微震；M＝2～4的地震称为有感地震；M＞5的地震，对建筑物就要引起不同程度的破坏，统称为破坏性地震，M＞7的地震称为强烈地震或大地震；M＞8的地震称为特大地震。
Are you a top student in your school, or at least a top one in your class? If not, you may learn something from my story. Growing up in a poor family with uneducated parents, I was not good at my study. But a teacher changed my life. Without her, I couldn’t have 36 so much in my later career. I can still remember the very important day that has 37 my whole life. I did so 38 in math that you may not imagine that I even couldn’t count from “ONE” to “TEN”, when I was in Grade Three. Then the 39_ day came. My father was asked to come to school to 40_ with my teacher, Ms King. You can’t imagine how angry and 41_ my father was when he heard about my “excellent achievement”. He 42 at me：“since you can’t even count from ‘ONE ’to ‘TEN’, what are you able to be when you 43_ up? Now, tell me！”I was scared and 44_ and didn’t know what to say and tears came immediately into my eyes. Then the most unforgettable time in my life came. “Maybe he can be a boxing refereeone day. That 45 only needs him to count from ‘ONE’ to ‘NINE’, which may 46 him well.” Ms King looked into my eyes and firmly said. Now, I am in my forties, and can you believe it that thanks to Ms King, I am really a well-known boxing 47 of WBO(World Boxing Organization),and that I do need to count only from “ONE” to “NINE”? So are still worried about your poor grades at school? Remember there will always be a place waiting for you!
|