题目

下图表示糖类的化学组成和种类，则相关叙述正确的是                    (  ) A.①、②、③依次代表单糖、二糖、多糖，它们均可继续水解 B.①、②均属还原糖，在加热条件下与本尼迪特试剂发生反应将产生砖红色沉淀 C.④、⑤分别为纤维素、肌糖元，二者均贮存能量，可作为贮能物质 D.④是植物细胞壁的主要成分，使用纤维素酶可将其破坏，④的合成与高尔基体有关    Do you feel 【1】difficult to be happy all the time? Now I’ll give you some Tips 【2】how to make yourself happy. One way is being 【3】(self) because unselfishness is the key factor 【4】 (require) if you want to get along well with others. By 【5】(say) being unselfish we mean we 【6】not want everything our own way or demand the best share of everything. Another way is to look for good points in 【7】people. You will find most people pleasant to go with and it will surely make you happy. Third, you can’t expect to be too perfect, 【8】don’t be too unhappy when you make mistake. Everything will be Ok if you try to make things right. Finally, it is important to remember that while you are no 【9】(bad) than others, chances you have may not be much better in this case, 【10】 best way to be happy is to think yourself above other people.