某化合物由碳、氢、氧三种元素组成，其红外光谱图中有C—H键、O—H键、C—O键的振动吸收，该有机物的相对分子质量是74，则该有机物的结构简式是(　　)

在等高线地图上，等高线的弯曲部分向高出凸出，表示该处是（    ）

    （一）夫君子之行，静以修身，俭以养德。非澹泊无以明志，非宁静无以致远。夫学须静也，才须学也，非学无以广才，非志无以成学。淫慢则不能励精，险躁则不能冶性。年与时驰，意与日去，遂成枯落，多不接世，悲守穷庐，将复何及！

    （二）文征明临写《千字文》，日以十本为率，书遂大进。平生于书，未尝苟且，或答人简札，少不当意，必再三易之不厌，故愈老而愈益精妙。

   Bob was happy. He was at a new school, and the other students were friendly. “Hi, Bob!” They said. But some students said, “Hi, Peter!” Bob didn’t understand. He asked another student, “ Why do some students call me Peter?”
   “Oh, that is easy to answer,” the student said. “Peter was a student here last year. Now, he goes to a different school. You like Peter. Some students think that you are Peter.”
   Bob wanted to meet Peter. He got Peter’s address(地址) from a student and went to Peter’s house. Peter opened the door. Bob couldn’t believe his   eyes. He looked really like Peter! Bob and Peter had the same color eyes and the same smile. They had the same black hair. They also had the same birthday.
   Bob and Peter found out that they were twin brothers. They both were adopted(领养) by two different families. Soon after the boys born, one family adopted Bob, and another family adopted Peter. Bob’s family never knew about Peter, and Peter’s family never knew about Bob, either.