（西晋时）天下荒乱，百姓饿死，帝曰：“何不食肉糜？”（《晋书·惠帝本纪》），产生

My life, as it really is, is always filled with sadness and little joy. However, no matter what happens, I can always face it       .

In July, last year, I couldn't believe the news that I was      to enter the only key high school in my hometown. Then I rushed to my home and told my parents. But my father didn't seem as         as I was. He just kept smoking without saying a word and my mother put her head down and couldn't help _      .

What I saw didn't make me surprised. I knew very well _    my family was like. My mum had been in bed for two years because of her disease. I knew my family lived a hard life and couldn't afford my tuition fee(学费). I felt so upset at that moment but I could say         to my parents.

I decide to help my father with his work to support my family instead of       my schooling.

To my surprise, things completely changed just three days before the beginning of the new term. My head teacher who had taught me three years came to my family with some money, which had been raised(筹集) by my schoolmates. He encouraged me, “Always have    .”

At the same time, my father also earned some extra money, he tried his best to afford part of my tuition fee.

I knew I was such a lucky dog and decided to study harder in return. With tears in my eyes, I stepped into the key high school        I had dreamed of.

I have been studying hard since I entered the high school. Whenever I meet difficulties, I always think of my teacher and schoolmates, and I can always get enough courage to go on. Because I have a college dream and must work hard for it no matter how hard life is. Just as a saying goes, “When one door shuts,      opens in life.”

下列现象中，不属于地球形成初期的现象的是[ ]

A．熔岩横流

B．火山喷发

C．风雨交加

D．电闪雷鸣

在某年的流行病学调查中，在平均潜伏期内，某小学发现并确诊百日咳12例。

发病情况属于（）

A.散发

B.流行

C.大流行

D.暴发

E.地区性

何谓交换器反洗操作时应注意哪些事项？

肾的球旁细胞能分泌（）。肾小囊腔内的液体称（）。