题目

Everyone can benefit from making an effort to practice gratitude(感激)every day. The following three steps can help you start feeling more grateful, and appreciative of the good things in your life:   Notice the Good Things in Your Life 36.________ Pay attention to the small everyday details of your life-nature, people, community, shelter, creature comforts like a warm bed or a good meal. And then start a gratitude journal(日记). Making a commitment (承诺,保证)to writing down good things each day makes it more likely that we will notice good things as they happen. Enjoy the饮料中的果味大多来自酯类。丁酸乙酯(C6H12O2)是无色具有菠萝香味的液体,常用作食品、饮料的调香剂。下列叙述中正确的是   A.丁酸乙酯是由20个原子构成的      B.丁酸乙酯中碳元素的质量分数为27.6%。   C.丁酸乙酯中碳、氢、氧元素的质量比为18:3:8 D.一个丁酸乙酯分子中,碳、氢、氧原子的个数比为3:6:2
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