问题 选择题

太阳活动对地球产生的影响有(       )  

①干扰无线电短波通信        

②扰动地球磁场,产生“磁暴”现象

③形成五带                  

④两极地区高空的一些极光

A.①②③④

B.①②④

C.②③④

D.①②③

答案

答案:B

本题考查太阳活动对地球的影响。太阳活动对地球的影响:引起电离层挠动,影响无线电短波通讯;产生磁暴现象;产生极光现象;对地球气候产生影响,太阳黑子活动周期往往与地球各地年降水量变化周期有相关性。所以本题选择B选项。

选择题
填空题

Good afternoon, everybody. I’m pleased to be here with you, graduates of 2007. I’m a (1) , and students often approach me with (2) . You see, we are living in a society of great changes. With the presence of (3) , the process of getting a job in today’s world has changed for (4) .
Well, how can you use new technologies to help you First, let’s look at how you (5) . The traditional method of hunting for a job in the past required first, doing research on jobs that were (6) , typically by looking in newspapers, periodicals and magazines, as well as TV ads, and (7) . Then you decided where and for what post you were going to apply, put your resume (8) in a stamped envelope, and waited anxiously for someone to (9) .
Well, today, maybe the job search and (10) are very much the same, but the tools used are much more advanced, and they (11) . In fact, technology has not so much changed the process as enhanced it. The benefit, both for (12) , is that this makes the search more open to people of (13) from all over the world. But as more people are involved, it becomes (14) for the applicant than it ever was before.
The (15) for the working world today is learning these new and (16) and combining them with the older methods people have been using for years. For example, (17) , you can research employment not just in your city, but also in your state, your country, and (18) . You can copy information from a web page and paste it into a Microsoft Word document that’s easy to (19) . In many ways, it’s easier now: Just type your job application, click, and (20) ; it gets there in an instant.