题目

关于电磁场理论的叙述不正确的是（ ） A . 变化的磁场周围一定存 在着电场，与是否有闭合电路无关 B . 周期性变化的磁场产生同频率变化的电场 C . 变化的电场和变化的磁场相互关联，形成一个统一的场，即电磁场 D . 电场周围一定存在磁场，磁场周围一定存在电场 答案：DYears ago, if a teenager had some problems in his life, he might go home and write in his diary; now, a teenager with  21    problems might go onto the Internet and write about them in a blog(博客). In many ways, a diary and a blog are very  22  . But what makes bolgging different from writing in a(n)       23   diary?    The biggest difference is that a blog is much more 24   than a diary. Usually, a teenager treats his diary like a book full of  25   that he does not want to  26   with others.    It’s interesting that someone who writes in a blog  27  a diary will probably write nearly the same information.    I have a little sister, and sometimes I go online to read her  28  . She writes about things like waking up early for swimming practice and not studying enough for her chemistry test.   29  I was her age, I wrote about the same things, but  30   in my dairy. Then, after I had finished writing, I would hide my diary in a secret place because I was  31   that my sister might read it.   The biggest  32   with blogging is that anyone can read what you write. If I was angry with a friend during high school and wrote something  33   about him in my diary, he would never know.  34  , if my sister ever wrote something bad about a friend, that friend might 35    her blog and get angry.    There are also  36   to blogging, of course. If I was feeling sad one day and wrote in my diary, “ Nobody cares about me”, because no one would   37   about it. However, if my sister wrote the same sentence in her blog, her best friends would quickly  38   and tell her how much they 39    her. Blogs help people  40  in contact with their friends and know what the people around them are doing. 1.A. the same           B. interesting                     C. difficult                  D. daily 2.A. simple                          B. special                             C. similar                    D. different 3.A. personal            B. ordinary                          C. meaningful           D. traditional 4.A. attractive          B. public                               C. exciting                  D. quick 5. A. thoughts           B. puzzles                            C. ideas                      D. secrets 6.A. tell                                B. share                               C. publish                   D. solve 7.A. instead of          B. as well as                       C. except for             D. besides 8.A. blog                     B. diary                                C. report                    D. web 9.A. Although            B. Since                                C. When                     D. Because 10.A. only                            B. already                            C. still                        D. never 11.A. angry                         B. sad                                   C. glad                        D. worried 12.A. problem                    B. doubt                               C. question                D. mistake 13.A. boring                        B. wrong                              C. mean                      D. funny 14.A. So                     B. However                         C. Therefore              D. Then 15.A. steal                          B. break                               C. write                      D. read 16.A. reasons                     B. wishes                             C. shortcomings       D. advantages 17.A. care                           B. know                                C. think                       D. ask 18.A. prepare                     B. begin                               C. respond                 D. feel 19.A. like                    B. miss                                 C. need                       D. stand 20.A. lose                            B. stay                                C. leave                      D. find