What on earth does happiness mean? I can’t give you its exact definition, but I’m sure if you love and help 16.        , you’ll get it.

I’ll never forget an old lady. She lives in 17.      small house alone. It is said that her husband and her son 18.    （die）in a road accident years ago. Her life is bitter, but she often helps others 19 .    a smile. Whenever it snows, she is always the first to clean the paths. She looks after several children living nearby. I am one of them. I often remember the stories she told us and her kind smile. Perhaps she is unlucky, but I think she is a happy person. Her life is full of 20.     （laugh）and love.

But I’m sad to see some people getting their happiness in bad ways. They talk 21.    （noisy）in cinemas and meeting rooms; they destroy trees to enjoy themselves and they laugh at others’ shortcomings. Perhaps they feel happy at that time, 22.       they will never get true happiness because they 23.      （lose）their personality already.

Now I know what happiness is. 24.     means kindness, love and unselfishness. Above all, I have come to understand that 25.      （bring）happiness to others is getting ourselves happiness.

关于质量流量计FE-10711的切换操作正确的是（）。

A、将相关控制阀置手动

B、用齐聚物冲洗备用流量计

C、现场打开流量计的出入口阀，投用备用流量计

D、中控通过HS-10711选择开关将备用流量计选择为在线