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.
16（）
A.shelter
B.free
C.isolate
D.nurture
参考答案：A
解析：
shelter在此句用作动词，意思是“保护”，相当于protect，用法是shelter…from…，如：These plants must be sheltered from direct sunlight.“这种植物必须遮起来，免受阳光直射。”[B]free也能与from搭配使用，free…from…的意思是“从……解放出来，摆脱”，如free from anxiety“不再担忧”，[C]isolate“使孤立”，如：The patient should isolate from his child.“这个病人必须立刻和他的孩子隔离”；[D]nurture“培育，养育”，如：We must also identify and nurture new talent.“我们也必须识别和培养新的人才”；题句说的是保护孩子使他们不受负而东西的影响，所以选择shelter符合句意。