摘要:II. 举行,进行 III. hold on等一等

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为探究植物细胞膜的透性,某同学以红甜菜根(液泡中含有花青素)进行下列实验:
A.将不同切片放在不同温度的蒸馏水中处理1分钟后取出。
B.再分别放在清水中浸泡1小时而获得不同的切片浸出液。
C.测量这些溶液的花青素吸光度,得结果如下图。

请回答以下问题:
(1)上述实验操作步骤的叙述存在着一个明显的不足,没有遵循实验设计的    原则。请你对上述实验中的不准确的操作重新进行叙述:            
(2)由上图中的曲线你可以得出的结论是                    
(3)已知物质A能促进细胞膜上载体的活性。有人认为:经过不同温度的处理是影响了细胞膜上运载花青素的载体的活性。请你借助上述材料设计实验证明该观点是否正确。
材料用具:略。
实验步骤:
                                                                   
                                                                  
                                                                   
(2)预测结果及结论:
                                                                   
                                                                   
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完形填空,阅读下面的短文,掌握其大意,然后从短文后各题所给的A、B、C、D四个选项中,选择最佳选项。

  My stutter(口吃)had always been much of a problem.I'd had so many specialists for my   1   over the years.As l walked down the hallway to meet a new one, memories popped in my head of how painful(痛苦的)being a kid who stutters had been.It   2   hurt.

  “Hello! I'm Mrs.Claussen.I hear you're from Texas! "

  “Ye-Ye-Ye-Yes m-m-m-m-m-m-m-aam I am…”My heart felt like it was pounding through my chest and my hands were dripping wet.I really blew that

    3  

  “Well, " she said with a   4   Smile.161've always liked Texas."

  She turned out to be the best speech specialist I've ever had, not like those who

  told me to clap my hands while speaking.She was   5  .She spent the first several weeks just talking to me-asking me all kinds of questions about myself, especially my feelings.And she   6  .She then began to teach me about the speech.Not just about my speech, but about everybody's.

  I   7   in my old school and was a pretty good tenor(男高音), but I learned that the new school's singing group was all filled up.It was such bad news, for I thought that was the one thing I could really do well-and I could do it

    8   stuttering.Somehow Mrs.Claussen finally got me in the group.I felt like she really cared about me as a person, not just a speech student.

  During the next two years, my speech didn't get much better-except with her.When I was in college, things got worse.I once even wondered if I would ever be able to   9   ! It was a very depressing time, and I often felt alone.When I was feeling really sorry for myself, I remembered Mrs.Claussen had told me whether I could   10   my speech was all up to me.She had told me not to fight for perfect speech, just better speech.She was right about that.I finally improved my speech greatly.

  Many years have passed, but I think of her from time to time, wondering if she had as much   11   0n her other students as she had on me.I like to think that she did.Her name was Mrs.Claussen...and she   12  .I'II never forget her.

(1)

[  ]

A.

speech

B.

study

C.

dream

D.

fear

(2)

[  ]

A.

maybe

B.

even

C.

still

D.

never

(3)

[  ]

A.

instruction

B.

description

C.

introduction

D.

presentation

(4)

[  ]

A.

shy

B.

cold

C.

weak

D.

kind

(5)

[  ]

A.

silent

B.

simple

C.

direct

D.

different

(6)

[  ]

A.

cried

B.

listened

C.

waited

D.

stopped

(7)

[  ]

A.

sang

B.

spoke

C.

played

D.

clapped

(8)

[  ]

A.

against

B.

besides

C.

beyond

D.

without

(9)

[  ]

A.

practise

B.

communicate

C.

report

D.

reply

(10)

[  ]

A.

train

B.

share

C.

change

D.

follow

(11)

[  ]

A.

advice

B.

influence

C.

dependence

D.

action

(12)

[  ]

A.

continued

B.

taught

C.

agreed

D.

cared

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