27. -Do you want to go to the cinema tonight?
-Sorry, I’m so tired, I an early night.
A.have B.am having C.have had D.had
25.Let's go a little faster, we’ll never get there on time.
A.yet B.or C.so D.and26.With age,the mineral content of human bones decreases, them more fragile.
A.make B.to make C.made D.making
24.一How long have you been here?
-Only about five minutes.Henry and Simon here with me.
A.walk B.have walked C.walked D.had walked
23.-Was problem solved?
-We were trying to think of way out,but it was difficult to find one.
A.a;a B.a:the C.the;a D.the;the
22.Take the spare batteries with you you need them.
A.so that B.even if C.as long as D.in case
第一节:单项填空(共15小题,每小题1分,满分15分)
从A、B、C、D四个选项中,选出可以填入空白处的最佳选项,并在答题卡上将该项涂黑。
21.-Which T-shirt do you prefer? Blue or green?
- will be OK.I don’t mind.
A.Either B.Neither C.None D.Each
31.(18分)
利用农作物秸秆等纤维质原料生产的乙醇,经加工可制成燃料乙醇。使用燃料乙醇减少了对石油资源的依赖.下图为生产燃料乙醇的简要流程,请据图回答:
(1)欲从土壤中分离获取,微生物A,应采用具有 功能的培养基。调节pH后的培养基还需尽快进行 处理,方能使用。
(2)图中①过程需要利用微生物A所产生的 酶对纤维质原料进行水解。可溶解复合物的产量与该酶活性有直接关系,衡量此酶活性的指标可用 表示.
(3)图中②过程常用的微生物是 ,此时其细胞呼吸类型是 ,细胞呼吸既能为微生物的生长提供物质,还能提供 。
(4)通过图中微生物的分解作用,不仅增加了人类对纤维质原料中能量的利用途径,还促进了生态系统中的物质在 与 之间不断地循环往返。
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