乙醇在甲烷菌的作用下可以转化为甲烷，有人对该反应曾做过如下的同位素实验（D、T为H的同位素）：在同样条件下，下列反应的产物分别为
If you want to get the most out of the study of a language, you must also read for pleasure: novels, plays, travel books, and so on. And in reading books of this kind the important thing is to get on
下列词语中加点的字，每对的读音完全相同的一组是（ ） A．殷勤/殷切 迫击炮/迫切性 绰约/绰绰有余 擢发难数/数典忘祖
用高倍显微镜观察植物细胞有丝分裂中期图，清晰可见的结构是 A．染色体 纺锤体 细胞壁 B．染色体 赤道板 细胞膜 C．细胞壁
中小企业是我国最具活力的企业群体，在GDP中的比重约为60%，提供了约70%的城镇就业岗位。自2011年以来，受需求不足、成本上升等不利因素的影响，中
If you have ever been in a school play or even made believe you were a doctor, detective, or a space traveler, you know the enjoyment that acting brings. Almost all of us have the wish to play the
IT is always hard for a small fish to live in a big pond. Pluto’s recent departure(离开) from the classical planet family clearly proves that size really matters. Astronomers voted on August 24 to
下列说法正确的是（ ） A．糖类、油脂、蛋白质都能发生水解反应 B．糖类、油脂、蛋白质都是由C、H、O三种元素组成的 C．糖类、油脂、蛋白质都
的解为（ ）
B. 
C. 
D. 
