请找出下面每个段落的主题句。 If you hadn't known them, you would have thought Joe and Jim were quite alike. They were both tall and wore long and fair hair. They both walked with a steady stride ( 坚定的步伐 ). They both spoke in a deep voice that made themselves seem much older than they really were. Both of them wore dark clothes as a rule, and they liked light coloured ties. But that was all the likeness they had. In other things they were sharply different. Joe was considerate and helpful, and everyone liked him. Jim, however, was very selfish and often flared into terrible anger ( 勃然大怒 ) at little things that displeased him. Alike as Joe and Jim were on the surface, they were really very different in nature. People who talk and sing to plants have no mental problems at all, according to an agricultural expert. "In fact, singing and talking to plants makes them grow better," says Dr Braymar. The reason is quite simple. When we sing or talk to plants, we exhale( ) CO2 which plants need to survive (continue to live)and grow better. Plants absorb (take in) CO2 through their pores( 小孔 ) during the sunlight hours and produce oxygen which people to survive. Singing and talking have good effect on plants, however, only during the daytime. Singing or talking at bedtime will not help plants to grow better or grow faster. When you throw a ball up into the air as fast as you can, the ball reaches a point where it seems to pause for a moment, and then it comes down. When a bullet ( 子弹 ) is shot straight up, it will travel much faster and higher than a ball, but it, too, will come down. Whatever goes up must come down. We have always thought this to be true. An airplane may climb to a height of seventeen miles and then travel far and long. Yet it does not stay up forever. Finally, like everything else, the plane must come down. 2 、选择正确选项。 Joshua Bingham studied 4 years at the University of Paris and decided to leave his graduation. He transferred to the University of Berlin and graduated with honors. Harvard Law School and, later, Boston College provided him with an excellent legal background. He is presently a corporation lawyer in Miami, Florida. Q: What is the main idea of the passage? A.How Joshua Bingham became a lawyer. B.Bingham is a diligent student. C. Joshua Bingham received an excellent education. D. A good lawyer needs good education.