题目

在一个成分复杂的生态系统中，对保持生态平衡起决定作用的是（ ） A . 非生物的物质和能量 B . 生产者 C . 消费者 D . 分解者 答案：B完形填空 　　Mr Brown’s house is near Mr Smith’s. Every Saturday he goes (1) Mr Smith’s door and (2) Mr Smith. He tells Mr Smith he (3) something.“I’m going to clean my house today.” (4) he says, “I’m going to wash (5) car tomorrow.”or he (6) , “I’m going to (7) a lot of machines (8) week.” (9) after that he (10) it. 　　So when people talk (11) Mr Brown, they don’t (12) him Mr Brown (13) John. They call him“ (14) Going-to-do”because he always says he is going to do (15) , (16) he doesn’t do it. 　　Many parents (17) often say to their children：“It’s not good to talk (18) every day, but do nothing like Mr Brown.If（如果）you want (19) something. You must do it. Don’t be (20) Mr Going-to-do.” (1)A．to B．at C．in D．for (2)A．speaks in B．speaks with C．talks for D．talks to (3)A．is doing B．is going to do C．does D．do (4)A．with B．and C．or D．but (5)A．his B．hers C．my D．mine (6)A．talks B．speaks C．says D．tells (7)A．start B．get C．do D．make (8)A．on next B．next C．last D．the last (9)A．And B．Or C．But D．Also (10)A．don’t do B．doesn’t do C．does D．do (11)A．to B．with C．at D．about (12)A．call B．say C．make D．name (13)A．of B．and C．or D．but (14)A．Miss B．Mr C．Mrs D．uncle (15)A．thing B．anything C．nothing D．something (16)A．and B．or C．but D．uncle (17)A．at school B．at home C．there D．here (18)A．a lot B．a little C．a few D．quite (19)A．do B．to do C．a few D．doing (20)A．a B．another C．other D．the other