声束穿过界面时方向发生改变，称做（）。 A.入射角度 B.折射 C.正常反射 D.后

以下为动物体和人体都不具有的是：     （ ）

A．细胞壁

B．细胞膜

C．细胞质

D．细胞核

Pierre is a 25-year-old penguin at the California Academy of Sciences. Due to his old age, he was going bald, which made him feel too cold to swim in the pool. Therefore, biologists at the academy had a wetsuit created for this penguin to help him get back in the swimming pool.

Unlike marine mammals, which have a layer of blubber to keep them warm, penguins depend on their waterproof feathers. Without them, Pierre was unwilling to jump into the swimming pool and ended up trembling on the side of the pool while his 19 peers played in the water.

"He was cold; he would shake," said Pam Schaller, a senior biologist. Schaller first tried a heat lamp to keep Pierre warm. Then she got another idea: if wetsuits keep humans warm in the cold Pacific, why not make one for Pierre?

Schaller designed the suit, which covered Pierre’s body and had small openings for his flippers.

"I would walk behind him and look at where there were any gaps, and cut and refit and cut and refit until it looked like it was extremely suitable," she said.

One concern was that the other penguins would reject Pierre in his new suit, but in fact, they accepted his new look. He swam freely and got along with others well, although he was the only penguin with a black stomach.

Schaller couldn’t say for sure whether the wetsuit allowed Pierre to recover his fine feathers, but "certainly we were able to keep him comfortable during a period of time that would have been very difficult for him to stay comfortable".

Pierre will take off his suit after his new feathers grow back.

小题1: Pierre felt too cold to swim in the pool because of _____.

A．not having a layer of blubber

B．having few feathers due to old age

C．having no wetsuit

D．others penguins rejecting him小题2:The idea of making a wetsuit for Pierre came from _____.

A．total invention

B．the use of wetsuit on humans

C．the use of heat lamp

D．waterproof feathers小题3: Schaller followed Pierre in order to see _____.

A．whether other penguins would reject him

B．if anywhere of wetsuit needed to be cut and refit

C．if the wetsuit kept warm

D．whether the wetsuit would keep the feathers from recovering小题4:What does the underlined word in the second paragraph mean?

A．feeling scared

B．staying alone

C．shaking with cold

D．keeping warm小题5:The best title of the passage is _____.

A．Wetsuit for An Old Penguin

B．Old Penguin Getting Bald

C．Unwilling to Swim

D．Strange Look of Pierre

材料一：据统计，2007年城乡居民收入比为3．33：1，2008年为3．31：1，2009年又回到3．33：1。城乡居民收入差距仍在继续扩大。收入差距扩大，消费差距也随之扩大。

材料二：2009年中央财政用于“三农”的支出7253亿元，增长21．80%。2010年中央财政拟安排“三农”投入8183亿元，比上年增加930亿元。同时，继续实施对种粮农民直接补贴，增加农资综合补贴、粮种补贴、农机具购置补贴，中央财政拟安排补贴资金1335亿元，比上年增加60．4亿元。

请你回答：

（1）出现材料一中现象的原因有哪些？（试列举两条）

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（2）采取材料二中的措施有什么重要意义。

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（3）请你为缩小城乡差距献计献策。（两条以上）

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容易引起压片过程中粘冲的是（）

A、颗粒大小悬殊

B、颗粒含水量过多

C、细粉太多

D、颗粒硬度较小

E、混合不均匀

核素骨显像较X线检查提前多长时间发现有恶性肿瘤骨转移（）

A.0.5～1个月

B.2个月

C.3～6个月

D.7～9个月

E.9～12个月