下列各组物质，按单质、氧化物、混合物顺序排列的是（ ） A．石墨、氯酸钾、石油

It was about six years ago.We were at senior high school.Those days in school were gray to most Chinese students because of the college entrance examination pressure.Not our parents and teachers didn't love us，but they loved us too much.Our only happiness was a high grade in the exam.

One afternoon after the final exam，we four girls came to a small wood and we felt it only belonging to us that afternoon.We talked and laughed.We played all the games that we could think of.We felt we were on the top of the world for the first time in our life.We totally forgot the unhappiness in our life and we threw the homework and the endless exams far away out of the wood.

In the middle of the wood ran a small and peaceful stream.Now and then，we could see some wild ducks on the water looking for food.The water weeds danced happily while the water passed beside them.The air was so fresh that we breathed it freely.

The sun had set before we knew it.We had to leave the place which brought us much happiness.We agreed to come back again every time we felt bored.

Years later，we went there several times.But，every time we went there to find that great feeling，we failed.Strangely，the feeling was different from that of several years ago.

I know that wonderful experience was just for once.We can never find that kind of happiness again which only belonged to the special afternoon in our life.That was a release of our uneasy heart.We can never go back to that young age or that simple life.It was our golden ages.No matter how boring and hard the life was，it gave us something worthy to recall.We'll treasure it forever.

小题1:What does the writer think of their senior high school life?

A．Unhappy.

B．Helpless.

C．Useless.

D．Meaningless.小题2:What does “it” refer to in the second paragraph?

A．The final exam.

B．Happiness.

C．A small wood.

D．A high grade.小题3:What does the second paragraph mainly tell us?

A．How the girls forgot everything in the wood that afternoon.

B．How the girls played games in the wood that afternoon.

C．How peaceful the wood was that afternoon.

D．How the girls relaxed themselves in the wood that afternoon.小题4:What did the writer introduce to us in the third paragraph?

A．Hungry wild ducks.

B．Dancing water weeds.

C．Fresh air.

D．A peaceful stream.

验收人员岗位职责主要有哪些？

下列情形中，终结诉讼的是（）。

A.一方当事人丧失诉讼行为能力，尚未确定法定代理人的

B.被告死亡，有遗产，没有应当承担义务的人的

C.追索抚育费案件的一方当事人死亡的

D.建立收养关系案件的一方当事人死亡的

在SQL嵌套查询中，量词ANY和量词（）执行效果是一样的。

A.ALL

B.SOME

C.MANY

D.LOT

渐开线齿轮的正确啮合条件是（）

A、两轮棋数相等

B、两轮压力角相等

C、两轮模数和压力必须分别相等