28.Every child is __________, with their own needs, preferences and talents.
A. productive B. familiar C. original D. unique
27.In the Gulf of Mexico the animals' presence close to shore means their usual habitat is badly polluted, and the crowding could ________ mass die-offs as fish run out of oxygen.
A. result from B. benefit from C. devote to D. result in
26.Two pages of the original manuscript (底稿) of Albert Einstein's General Theory of Relativity were________ on display in the Israel Pavilion of the 2010 World Expo in Shanghai.
A.put up B set down C. sent up D. taken up
25.Keep in mind: your efforts will ______.Don’t let one or two failures over the year get you down.
A take off B. put off C. pay back D. pay off
24.The government _________ the diplomatic (外交的) note from that country for its unclear attitude to the trade between two countries.
A. denied B. suggested C. rejected D. ignored
23.Having finished his morning work, the manager stood up behind his chair, _______ himself. A. practising B. spreading C. stretching D. extending
22.She’s hoping her first performance in the US will be the first step on the road to success, then she wants to try her ________ in Hollywood.
A. profit B. fortune C. distinction D. wealth
第一节:多项选择(共10小题;每小题1分,满分10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。
21.As a good teacher, he should use different ways to encourage all children to realize their full
and achieve their goals.
A.possibility B.motivation C.potential D.awareness
39.(6分)植物中的淀粉酶主要是α-淀粉酶和β-淀粉酶,小麦种子中同时含这两种淀粉酶。已知α-淀粉酶不耐酸,在pH3.6以下迅速失活;β-淀粉酶不耐热,在70℃下15min会变性失活。种子萌发时,这两种淀粉酶活性随萌发时间迅速增加,将淀粉分解成小分子糖类,供幼苗生长。
某小组想设计实验比较种子萌发过程中α-淀粉酶和β-淀粉酶活性的大小,请完成以下方案并回答相关问题。
(1)方法步骤:
①取适量的萌发小麦种子,研磨过滤,得到酶的提取液;
②取两支试管编号A、B,同时滴加等量的酶提取液,并分别对A、B做如下处理:
A管:_________________________________________________________________________;
B管:_________________________________________________________________________。
③向A、B两管中加入适量且等量的淀粉溶液,60℃恒温水浴中保温一段时间;
④向A、B两管加入等量的__________________,沸水浴一段时间,观察并比较A、B两管颜色的深浅。
(2)结果预测与结论:
①____________________________________________________________________________;
②____________________________________________________________________________;
③____________________________________________________________________________。
38.(6分)(实验班学生做)香豌豆是雌雄同花植物,有多种性状,各种性状的遗传方式各有差别。
(1)如果基因型RR的植株呈深绿色,基因型Rr的植株呈浅绿色,基因型rr的植株呈白色。深绿色和浅绿色植株的繁殖和生存能力相似,而白色植株会在幼苗阶段死亡。基因型为RR的植株在遮光条件下茎叶为黄白色,这是因为光照影响了 合成,说明生物性状的表现是
的结果。
现有一株浅绿色Rr的植株作亲本进行自花授粉得到F1,F1自花授粉得到F2,F2的成熟植株中浅绿色植株所占的比例为 。
(2)如果该植株的花有红色、紫色和白色,该性状受两对基因控制,同时有E和F基因的植株开红花,无E和F基因的植株开白花,只有E基因或F基因时开紫花。若基因型为EEFF的红花豌豆具有更强的抗逆性,且种子中蛋白质含量相对高,如何利用紫花豌豆在最短的时间内培育出此品种,写出简单的育种方案。(要求分条叙述,文字简洁,条理清楚)(3分)
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