— Would you like a cup of tea? — _______

如图所示，一块通有电流的铜板，板垂直磁场放在磁场中，板内通有如图方向的电流，a、b是铜板的左、右边缘上的两点，若两点的电势分别为φa、φb，则（   ）

A．φa>φb

B．φa<φb

C．电流增大时，Uab增大

D．其他条件不变，将铜板改为NaCl溶液时，电势差仍一样

按照皮亚杰的认知发展理论，小学生的认知水平应该处于前运算阶段。

阅读理解.

     Although it is less often read than such Wells' novelsas The War of the Worlds,the basic

story of The Island o fDr Moreau is very well known through several extremelyloose film

adaptations (改编 ). Prendick, aBritishscientist,has an accident at sea and by chance finds

himself on amysterious island where Dr Moreau and his assistant Montgomery are engaged

in strange experiments of turninganimals into humans.

     Wells was a social reformer,and his novels reflect(反映) his thoughts and theories about

human society. Much of  Wells'writing concerns ( either directly or indirectly) socialclass,

but Moreau deals with the then-newly advanced theoryof evolution (进化)-and then works

to relate how that theory influences man' s belief in God. Wells sometimes mentioned this in

his novels,but nowhere in his work i.s this line of thought more clearly and specifically seen

than here.

     Sometimes Wells tries to influence his readers strongly, while on other occasions,he does

it gently. But in The Island of Dr Moreau,Wells achieves a perfect balance of the twoextremes.

It is an impressive achievement,and in this sense I consider Moreau possibly the best of

Wells' works. The novel is as interesting for the story it tells as it is for its themes that are still

very important today.

     Moreau is not as horrific as Wells' many other novels--- he often included horror and

cruelty in his science fiction. Still,this is not a book that you can read and then put away: it

stays in your mind in a most disturbing way. Stronglyrecommended.

1.We learn from Paragraph 2 that Wells ______.

A. expressed his ideas about society in his novels

B. didn't mention the theory of evolution in Moreau

C. used his pen to fight for human rights

D. paid little attention to social developments

2. Which of the following can be learned from the passage?

A. Most of Wells' novels remain unknown.

B. Wells was a science fiction writer.

C. The Island o f Dr Moreau is a horror story.

D. Wells' writing style is humorous.

3. The author's attitude towards The I.sland o f Dr Moreau is that of ______ .

A. doubt

B. unconcern

C. praise

D. respect  

4. The passage is probably taken from.

A. an official document

B. a scientific article

C. a newspaper report

D. a book review

符合缺铁性贫血潜伏期的是

A．血清铁蛋白下降
B．血清铁下降
C．转铁蛋白饱和度下降
D．总铁结合力下降

简述模型库管理系统的功能。