光合作用的电子传递链与氧化磷酸化作用的电子传递链有什么异同？

Once there lived an old man. He liked gold (金子)better than anything else in the world. He often said, “If I have enough gold, I will be the happiest man in the world.”

One day when he was traveling in the desert(沙漠), the old man lost his way. He was very hungry and thirsty, but there were only rocks(岩石) and sand （沙子）around him. Just then, he found a bag lying on the sand. He hoped he would find water and food in it. He took up the bag and opened it. He saw that the bag was full(满的) of gold. He was so sad that he threw away the bag and began crying.

Now, the old man knew that there was something better than gold in the world.

小题1: The old man liked ____ best before he traveled in the desert.

A. food        B. water        C. gold

小题2: When he lost his way, he wanted to get ____.

A. some food and water  

B. some rocks and sand   

C. bags full of gold

小题3:What did he do with the bag? ______.

A. He didn’t take it up   

B. He brought it home   

C. He threw it away

小题4:The old man did not become the happiest man when he got the bag of gold because ____.

A. the bag was too small  

B. the gold wasn’t his   

C. he was very hungry and thirsty

小题5:In the end, the old man knew that gold was ____ in the world.

A. the best thing     

B. not the best thing  

C. better than anything

如图所示在粗糙的桌面上有一个质量为M的物块，通过轻绳跨过定滑轮与质量为m的小球相连，不计轻绳与滑轮间的摩擦，在小球下落的过程中，下列说法正确的是

A．小球的机械能守恒

B．物块与小球组成的系统机械能守恒

C．若小球匀速下降，小球减少的重力势能等于物块M与桌面间摩擦产生的热量

D．若小球加速下降，小球减少的机械能大于物块M与桌面间摩擦产生的热量

什么是自我概念？它由哪三个部分构成？

提高海员心理健康水平的措施主要包含（）。

①加强培训

②加强学习

③改善人际关系

④保持良好的心态

A.①②③④

B.①②④

C.②③④

毛 * * 逝世纪念日是哪一天？