下图是老师在课堂上进行的滚摆演示实验示意图，下列说法不正确的是（ ） A．滚摆运

商业助学贷款的借款人要求提前还款的，应提前( )个工作日向贷款银行提出申请。

A．5

B．10

C．15

D．30

阅读理解 

     The latest research suggests that the key factor separating geniuses from the merely accomplished is not IQ,a generally bad predictor of success.Instead,it's purposeful practice.Top performers spend more hours practising their craft.If you wanted to picture how a typical genius might develop,you'd take a girl who

possessed a slightly above average language ability.It wouldn't have to be a big talent,just enough so that

she might gain some sense of distinction.Then you would want her to meet,say,a novelist,who

coincidentally shared some similar qualities.Maybe the writer was from the same town,had the same family background,or,shared the same birthday.

     This contact would give the girl a vision of her future self.It would give her some idea of a fascinating

circle she might someday join.It would also help if one of her parents died when she was 12,giving her a

strong sense of insecurity and fuelling a desperate need for success.Armed with this ambition,she would

read novels and life stories of writers without end.This would give her a primary knowledge of her field.

She'd be able to see new writing in deeper ways and quickly understand its inner workings.

     Then she would practice writing.Her practice would be slow,painstaking and error focused.By

practicing in this way,she delays the automatizing process.Her mind wants to turn conscious,newly learned skills into unconscious,automatically performed skills.By practicing slowly,by breaking skills down into tiny parts and repeating,she forces the brain to internalize a better pattern of performance.Then she would find an adviser who would provide a constant stream of feedback,viewing her performance from the outside,

correcting the smallest errors,pushing her to take on tougher challenges.By now she is redoing

problems-how do I get characters into a room-dozens and dozens of times.She is establishing habits of

thought she can call upon in order to understand or solve future problems.

     The primary quality our young writer possesses is not some mysterious genius.It's the ability to develop a purposeful,laborious and boring practice routine.The latest research takes some of the magic out of great achievement.But it underlines a fact that is often neglected.Public discussion is affected by genetics and

what we're "hard-wired" to do.And it's true that genes play a role in our capabilities.But the brain is also

very plastic.We construct ourselves through behaviour.

1.The passage mainly deals with_____.

A. the function of IQ in cultivating a writer

B. the relationship between genius and success

C. the decisive factor in making a genius

D. the way of gaining some sense of distinction

2.By reading novels and writers' stories,the girl could       .

A. come to understand the inner structure of writing

B. join a fascinating circle of writers someday

C. share with a novelist her likes and dislikes

D. learn from the living examples to establish a sense of security

3.In the girl's long painstaking training process,      .

A. her adviser forms a primary challenging force to her success

B. her writing turns into an automatic pattern of performance

C. she acquires the magic of some great achievements

D. she comes to realize she is "hard-wired" to write

4.What can be concluded from the passage? 

A. A fuelling ambition plays a leading role in one's success.

B. A responsible adviser is more important than the knowledge of writing.

C. As to the growth of a genius,IQ doesn't matter,but just his/her efforts.

D. What really matters is what you do rather than who you are.

为避免加强型光缆外护扭曲变形，损伤纤芯，对于加强型光缆，可采取（）的方式布放。

A.机车牵引

B.倒“8”字

C.人工拖放

D.转动光缆盘

下列哪项肺功能试验指标不支持支气管哮喘的诊断

A．PEF减少
B．FEV₁/FVC减少
C．支气管舒张试验为阴性
D．FEV₁减少
E．RV/TLC增加

国家标准规定，炼钢铁的含[Si]量不大于（）。