27.Do not start a book unless you can see from the first few pages that it is ___ you can easily read and understand.
A.that B.the one C.one ' D.a one
26.A survey showed that women in Hong Kong were more romantic, with 34.3 percent of them ___ that love counted the most.
A.believing B.believe C.believed D.to believe
25.Here you are, Tommy.You ___ to take it.I was going to send it to you.
A.needn't have come B.didn't need to come
C.don't need to come D.needn't come
24.It was not until then that I came to know that knowledge ___ only from practice.
A.had come B.comes C.came D.has come
23.During Chang'e-2 Satellite's flight to the Moon, it ___ adjusts its direction so that it can go into its programmed orbit.
A.eventually B.gradually
C.constantly D.continuously
22.They have their reasons for keeping their marriage___ secret for ___ moment.
A.the; a B./;the C.a; the D.a; a
第一节:语法和词汇知识(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.-Could we put off the meeting?
-___. This is the only day everyone is available.
A.Not likely B.Not exactly C.Not nearly D.Not really
44.(16分)请同答下列有关遗传学的问题
I(1)孟德尔选取豌豆作为杂交实验的材料,主要是因为
。
(2)基因型为RR的豌豆表现为圆粒的原因是它合成较多的支链淀粉,从而能够有效保
留水分,这说明基因、蛋白质与性状的关系是 。
(3)摩尔根从野生果蝇培养瓶中发现了一只白眼雄性个体。他将该白眼雄果蝇与红眼雌果蝇杂交,F1全部表现为红眼。再让F1红眼果蝇相互交配,F2性别比为1:1,红眼,占3/4,但所有雌性全为红眼,白眼只限于雄性。请用遗传图解解释该现象(显性基因用A表示,隐性基因用a表示)。
II体色是划分鲤鱼品种不检验其纯度的一个重要指标。不同鲤鱼品种的体色不同,是由于鱼体鳞片和皮肤含有不同的色素细胞及其数量分布差异所致。科研人员用黑色鲤鱼(简称黑鲤)和红色鲤鱼(简称红鲤)杂交,F1皆表现为黑鲤,F1自交得F2,结果如表2所示,请回答下列问题。
表2
取样地点 |
取样总数 |
F2性状的分离情况 |
||
黑鲤 |
红鲤 |
黑鲤:红鲤 |
||
1号池 |
1699 |
1592 |
107 |
14.88:1 |
2号池 |
62 |
58 |
4 |
14.50:1 |
(1)鲤鱼体色中的 是显性性状。
(2)分析实验结果推测:鲤鱼的体色是由 对基因控制的,该性状的遗传遵循
定律。
(3)为验证上述推测是否正确,科研人员又做了如下实验:
①选择纯合黑鲤和纯合红鲤做亲本杂交获得F1:
② ;
③ 。
预期结果 。
(4)如果____与 相符,说明上述推测成立。
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