题目

下图是两个生态系统中腐殖质总量随时间而发生变化的情况，甲、乙曲线分别代表哪两个生态系统( )                                     A．热带雨林、温带森林B．温带草原、寒带针叶林C．寒带针叶林、热带雨林D．热带草原、温带草原 答案：C根据短文理解，从A、B、C、D四个选项中选择最佳答案填空。It was a Monday morning. When a teacher walked into the 1 , he heard a low voice: “Here is the teacher. I am 2this boring. fellow(烦人的家伙) is going to talk about putting in commas(逗号).” It was 3 voice. His name was Bill. He was talking 4 the boy next to him.The teacher didn’t get angry. He said 5 about it. He really began to talk about putting in commas, and then he wrote 6 the sentence. “Bill says the teacher is a boring fellow.’’The class 7 and Bill’s face 8 red.“Now,” said the teacher, “I’ll 9 you how important commas are.’’He put two commas in the sentence, and now read, “ 10 is a boring fellow.’’（1）A.library B.school C.classroom D.office （2）A.sorry B.sure C.glad D.surprised （3）A.his B.the teacher’s C.a boy’s D.a girl’s （4）A.with B.of C.about D.at （5）A.much B.everything C.something D.nothing （6）A.on his desk B.on the blackboard C.in his book D.in Bill’s exercise book （7）A.laughed B.stopped C.looked D.read （8）A.got B.changed C.turned D.grew （9）A.answer B.show C.ask D.give （10）A.The teacher says, Bill B.Bill, says, the teacher C.The teacher, says, Bill D.Bill, says the teacher，