国家垄断资本主义的产生和发展，从根本上说是(    )
   A．国内市场竞争的结果
   B．国际竞争激烈化的结果
   C．垄断统治加强的结果
   D．生产社会化和资本主义私人占有制之间矛盾发展的结果

Many of my students have difficulty taking tests. For some, the test situation causes great stress and tension. The minds of these students go blank when they receive the test paper. Others do not know how to study and, thus come to the test ill-prepared to answer the questions. Some students study correctly but do not follow the directions on the test. They are usually unable to finish the exam on time. These are some of the factors that contribute to the poor performance of certain students on tests. The first group of students problem on tests: Cause: ______________________________ Effect: ______________________________ The second group of students problem on tests: Cause: ______________________________ Effect: ______________________________ The third group of students problem on tests: Cause: ______________________________ Effect: ______________________________ 点击查看答案

细胞外基质是由大分子构成精细而错综复杂的网络，其含量较高的组织是( ) A．结缔组织 B．肌肉组织 C．脑组织 D．上皮组织 E．脊髓组织 点击查看答案