已知介质对某单色光的临界角为C，则[ ] A．该介质对单色光的折射率等于 B．此

阅读短文，回答问题。  

　　从前，地球也常被石头砸（zá）疼的，宇宙（yǔ zhòu）中飞舞着许许多多的石头。 　　　

　　有一次，地球对人们说：“给我做件外衣，让我不再被砸得这么疼，好吗？”      

　　玻璃（bō li）工人忙碌起来，为地球做了一件透（tòu）明的外衣。可是不行，石头把玻璃砸得七孔八洞的。大家发愁了，都没主意了。     

　　“我来试试看。”卖气球的营业员说。他一个接一个，把气球里的气朝空中放，要买气球的顾客排起了长队，他也不管，只顾忙着放气，直到地球全身裹着一件透明的空气外衣。大家觉得空气外衣挺好：透过它，依然看得见太阳；宇宙中的石头——那些陨（yǔn）石呢，撞进空气外衣，就像火柴似的，自己燃烧完了。        

　　卖气球的营业员还给地球的空气外衣取了个名字，叫“大气层”。    

1．照样子写词语。

许多—许许多多　　_______—_______                    

透明的玻璃　　　　_______的_______     

2．地球原来的外衣是什么外衣？原来的外衣为什么不好？

_________________________________________

3．营业员给地球的空气外衣有什么好处？ 

_________________________________________

4．地球的空气外衣的名字是___________。

5．用文中的加粗词造句。

_________________________________________

阅读理解。

     Dolphins and sharks are showing up in surprisingly shallow water just off the Florida coast. Mullets, crabs,

rays and small fish gather by the thousands off an Alabama pier. Birds covered in oil are crawling deep into

marshes (沼泽), never to be seen again.

     Marine scientists studying the effects of the BP disaster (英国石油公司漏油事件) are seeing some strange

phenomena. Fish and other wildlife seem to be fleeing the oil out in the Gulf and clustering in cleaner waters

along the coast in a trend that some researchers see as a potentially troubling sign. The animals' presence close

to shore means their usual habitat is badly polluted, and the crowding could result in mass die-offs as fish run

out of oxygen. Also, the animals could easily be captured by their enemies.

     The nearly two-month-old spill (漏油) has created an environmental disaster in US history as tens of millions

of gallons have flown into the Gulf of Mexico ecosystem. Scientists are seeing some unusual things as they try

to understand the effects on thousands of species of marine life.

     For nearly four hours Monday, a three-person crew with Greenpeace cruised past delicate islands and

mangrove-dotted inlets in Barataria Bay off southern Louisiana. They saw dolphins by the dozen frolicking (嬉

戏) in the oily sheen (光泽) and oil-tinged pelicans feeding their young. But they spotted no dead animals.

     "I think part of the reason why we're not seeing more yet is that the impacts of this crisis are really just

beginning," Greenpeace marine biologist John Hocevar said.

     The counting of dead wildlife in the Gulf is more than an academic exercise; the deaths will help determine

how much BP pays in damages.

1. What does the marine life react to the BP disaster?

A. Birds crawl deep into caves.

B. Dolphins and sharks show up in deep water.

C. Tens of thousands of marine animals are found dead.

D. Sea creatures flee from the spilled oil, gathering near the seashore.

2. The environmental disaster was caused by ____.

A. the damage of the Mexico Gulf ecosystem

B. the lack of environmental sense of BP

C. the nearly two-month-old oil spill

D. the crowding marine life

3. What is John Hocevar's attitude towards the disaster?

A. Worried.

B. Disappointed.

C. Depressed.

D. Optimistic.

4. From the passage, we can infer that ____.

A. BP will pay much money according to the number of the dead wildlife there

B. marine scientists have seen some strange phenomena

C. the disaster has little influence on dolphins

D. a three-person crew reached no conclusion

汽车的牵引力大于行驶阻力就可以行驶。

对于慢性肾衰竭饮食治疗原则，下列叙述哪项是错误的（）

A．高生物效价的低蛋白饮食

B．供给充分必需氨基酸

C．尽可能低磷饮食

D．充分热卡，力求达到正氮平衡

E．透析后仍应注意低蛋白饮食，以免加重肾衰竭

怎样理解“美术综合课程体系”？