Ⅱ语言知识及应用（满分35分）
第一节 完形填空(共10小题；每小题2分，满分20分)
阅读下面短文，掌握其大意，然后从21—30各题所给的A、B、C和D项中，选出最佳选项，并在答题卡上将该项涂黑。
Years 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 blogging different from writing in a traditional diary?
