Optimism is the art of always seeing the glass half full (1) half empty, finding something positive in even the most (2) of situations and last but not least the ability to expect the best even if the chances are (3) . It enables you to try new things, deal with failure as a learning experience (4) a stopping point. In general optimism gives you a reason to live. The world would be a better place if it was full of optimism, (5) unfortunately the trend in today’s youth is (6) the opposite way. Today it is (7) to be pessimistic. One could spend hours discussing how we arrived at this point, (8) our youth refuses to smell the roses and instead prefers to (9) themselves on their own pessimistic (10) .
Optimism is not an (11) gift but rather a learned behavior (12) . Like most behaviors optimism is best learned by watching examples, (13) you. The first step in creating a generation of people with a positive outlook on life, is to (14) life on the bright side yourself. (15) it would be wrong to (16) your child from all negativity, it is important that you are not the (17) of doubts and worries. Finding something positive in a negative situation needs to be (18) Show how to make the best of things by always (19) the positive, by encouraging your child after a(n) (20) and by explaining over and over that failure is just a part of progress.
13（）
A.primarily
B.frequently
C.namely
D.normally
参考答案：C
解析：
namely“即，就是，换句话说”，常用来对前面讲到的事作进一步解释，如：Only one person can do the job，namely you.“只有一个人能做这项工作。那就是你。”题句中提到“通过观察范例是学会乐观的最好方法”，然后具体解释说要从自己做起，从结构上看，只有namely有这种用法，其他选项用于修饰谓语，多出现在句子前半部分。[A]primarily意为“主要地，起初地”，如：The purpose of the program is primarily educational.“演出该节目的主要目的是为了进行教育。”[B]frequently“频繁地，经常地”，如：His speech was frequently interrupted by stormy applause.“他的演说不时被暴风雨般的掌声打断。”[D]normally“通常，正常地”，如：I don’t normally drink at lunch.“我午餐时通常不喝酒。”