26.The minister stressed that under no circumstances ____ the disabled to be looked down upon.
A.is B.are C.has D.have
25.It seems as if they are going to ____ us a lot of money for the party hall.
A.cost B.ask C.demand D.charge
24.It was with great excitement one morning in July ________ the young man read a classified advertisement.
A.when B.that C.who D.which
23.It is obvious that this anti-smoking ____ is mainly aimed at young teenagers.
A.campaign B.war C.battle D.fighting
22.He admitted that when ____ comes to repairing a computer, he had little knowledge of it .
A.he B.that B.this D.it
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,并在答题卡上将该选项的标号涂黑。
21.-Do you think the weather is good enough for the picnic?
-Yes.You couldn't hope for ____ day at this time of the year.
A.a nice B.the nice C.a nicer D.the nicest
4.测定各试管麦牙糖含量,计算总淀粉酶活性酶活性、α-淀粉酶活性和β-淀粉酶活性(如α-淀粉酶活性=实验组1测定值-对照组测定值。其它具体方法略)
回答问题:
a作为对照组,另一种做法是加入淀粉液但不加酶液,两者相比较,现行做法优点是______________________________________
b实验所测得β-淀粉酶活性=___________________________________
3.取试管三个,编号,按下表加入各液:(在答案卷填写1、2号实验组所缺的内容)
![]() 组别 |
1%可溶性淀粉液 |
酶液 |
对照组 |
0ml |
1
ml乙试管酶液 |
1号实验组(测α-淀粉酶活性) |
2
ml |
? |
2号实验组 (测总淀粉酶活性) |
2
ml |
? |
将以上各管试剂混匀后,置40℃水浴准确保温5分钟,取出后立即向1、2、3号试管中加入4ml0.4mol/LNaOH,以终止反应。
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