刷模

阅读理解。

     Prana was a beautiful dog, whose name means  "breath  of life". Although he died several years ago, I

can still remember the days we spent together and what he has taught me about love.

     I have two apple trees in the garden. Prana loved apples.  When he went outside, he'd catch an apple

and take it into the house to eat later.  The apples had been on the ground and were often dirty so I

wasn't always happy that Prana had brought them into the house.

     It was an autumn day in America, but it was very cold  A big snow fell and we had not done anything

for its coming.  On  that  special   day,   Prana  went  outside and I watched  him through the window.  I

noticed that he was madly digging (挖) holes and bringing the apples to the ground so they could be seen

above the snow. I did not know why he was doing this. He seemed to want to do something special.       .

     When I called him back, he had his usual  one  apple  in  his mouth. About five minutes later, I looked

outside.  The garden was completely covered with birds.  Prana  had  dug up all those apples for his bird

friends to eat. He knew that they wouldn't have stored enough food for the coming winter!

1. Prana was__________.                      

A. the writer                

B. a boy

C. a bird                    

D. a dog

2. I wasn't always happy because_________.

A. Prana loved apples

B. Prana caught an apple and ate it

C. `the apples fell on the ground and were dirty

D. Prana brought the dirty apples into the house            

3. On the snowy day, Prana ___________.

A. ate up all the apples

B. dug holes to put the apples in them

C. brought the apples under the snow to the ground

D. left the house and died

4. The birds flew to the garden to ____________.

A. look for Prana

B. eat the apples

C. make new homes

D. store food for the winter

5. The topic of the story is about ___________.        

A. apples              

B. animals

C. love                

D.life

下列因素中能影响物体在平面镜中成像大小的是（   ）

A．物体到平面镜的距离 　　　　

B．物体的大小

C．像到平面镜距离

D．镜面的大小

水稻种子中70%的磷以植酸形式存在。植酸易同铁、钙等金属离子或蛋白质结合排出体外，是多种动物的抗营养因子，同时，排出的大量磷进入水体易引起水华。

(1)磷元素除了形成植酸外，还可以出现在下列_______(多选)分子或结构中。

A．核糖 B．ATP C．核糖体 D．核膜

(2)种植芦苇能有效抑制水华的发生，表明芦苇与引起水华的藻类关系是________。

(3)植酸酶可降解植酸，在谷物类饲料中添加植酸酶可提高饲料的_________利用率。

(4)酵母菌中植酸的活性较高。图1是从不同类型酵母菌的发酵液中提取植酸酶的工艺流程。据图回答：

①．植酸酶_______(填“Ⅰ”或“Ⅱ”)属于分泌蛋白。

②．若植酸酶Ⅰ和Ⅱ的肽链组成不同，其差异体现在________。

③．提纯的植酸酶需做活性条件测定。图2为测定结果。图中的自变量可为_______(答一种)；因变量可以通过测定______来表示。

(5)为从根本上解决水稻中的高植酸问题，可将植酸酶基因导入水稻，培育低植酸转基因水稻品种。图3是获取植酸酶基因的流程。据图回答：

①．图中基因组文库________(填“小于”、“等于”或“大于”)cDNA文库。

②．B过程需要的酶是_________；A、C过程中_______(可以/不可以)使用同一种探针筛选含目的基因的菌株。

③．目的基因Ⅰ和Ⅱ除从构建的文库中分离外，还可以分别利用图中________和_______为模板直接进行PCR扩增，该过程中所用酶的显著特点是__________。

(6)已获得的转植酸酶基因水稻品系植酸含量低，但易感病，图4为选育低植酸抗病水稻品种的过程。图中两对相对性状分别由两对基因控制，并独立遗传。采用图中育种过程，需从________代开始筛选，经筛选淘汰后，在选留的植株中低植酸抗病纯合体所占的比例是________。选留植株多代自交，经筛选可获得低植酸抗病性状稳定的品性。

患者，男性，45岁。因脾破裂急诊行脾切除术，术后输血200ml后突发高热寒战、呼吸困难、呕吐腹痛。血压75/45mmHg，呕吐物和粪便隐血均为阳性。

该病人如果必须继续输血，应选用（）

A.新鲜血浆

B.红细胞悬液

C.血浆

D.新鲜全血

E.血小板

下表各组物质中，满足如图物质一步转化关系的选项是(　　)