27.It is becoming more and more difficult to the problems of traffic in some big cities of our country.
A.deal with B.set up C.put away D.break down
26.She thought impossible to finish so much work in a day.
A.this B.that C.its D.it
25.-I’ve told her many times, and she still forgot about it!
-I understand. It’s true that she be very forgetful sometimes.
A.can B.would C.should D.must
24.My mother made a promise I passed the examination, she would buy me an MP4.
A.that B.that if C.if that D.whether
23. in the city for thirty years, the old man moved back to the countryside.
A.Having worked B.Working C.To have worked D.To work
22.The woman scientist was so busy that she could hardly time to her children.
A.spend B.devote C.share D.provide
第一节单项填空(共l5小题;每小题l分,满分l5分)
从A、B、C、D四个选项中,选出可以填人空白处的最佳选项,并在答题卡上将该项涂黑。
21.On Feb. 6, Xi’an-Zhenzhou High Speed Railway, first high-speed railway in West China, was put into operation.
A.不填; the B.the; the C.the;不填 D.不填;不填
34.(10分)
苯丙酮尿症、白化病和尿黑酸症均为人类遗传病,其中苯丙酮尿症是由于苯丙氨酸代谢异常造成苯丙酮酸在血液中大量积累,使患者尿液中苯丙酮酸含量远高于正常人。尿黑酸症是由于尿黑酸在人体中积累使人的尿液中含有尿黑酸,这种尿液暴露于氧气中会变成黑色。
(1)图甲是苯丙氨酸代谢途径示意图,根据该图有人认为缺乏酶①时一定会同时患苯丙酮尿症和白化病而不会患尿黑酸症,你认为正确吗?请说明理由。 。
(2)图乙是一个尿黑酸症家族系谱图,请分析回答相关问题:
①该缺陷基因是 性基因,在 染色体上。
②如果III8同时还患有苯丙酮尿症和白化症,那么II3和II4再生一个同时患两种病的孩子的概率是 。
③现需要从第IV代个体中取样(血液、皮肤细胞、毛发等)获得该缺陷基因,请选出提供样本的较合适个体,并分析原因。 。
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