问题 单项选择题

蛛网膜下腔出血

A.先发热后有意识障碍
B.先有意识障碍然后发热
C.意识障碍伴心动过缓
D.意识障碍伴高血压
E.意识障碍伴呼吸缓慢

答案

参考答案:B

单项选择题

一个国际科学家小组携带数吨硫酸铁粉沫起航前往南极,以研究能否以硫酸铁为“肥料”促进南极海域海藻等微生物的生长来减缓全球变暖的速度。 

该小组的9名研究人员来自东吉利大学和普利茅斯海洋实验室。预计科学家们将于2月开始进行实验,届时他们将把数吨硫酸铁倾入倒入南极海域,同时还将向海中释放硫化六氟化合物示踪剂。该示踪剂可检测硫酸铁的变化和去向。 

铁元素可提高海洋系统生产力的理论在20世纪20年代就被提出,此后科学家们一直在对这一理论进行检验完善。科学家们近年来在位于赤道的太平洋海域进行实验时曾发现,硫酸铁确实能起到让蓝色海洋变绿的作用。硫酸铁不仅可大幅度提高该海域硅藻等藻类的生长,而且一些微生物体内的叶绿素还因此增加了20多倍。 

科学家认为,在南极海域研究铁元素与海洋生产力的关系具有更加重要的意义。一方面因为南极海域被认为在地球海洋中是最“缺铁”的,而这种营养缺乏很可能对该海域生产力造成了某种程度的限制。另外,与作为二氧化碳源的太平洋等海域不同,南极海域可吸收温室气体,其海洋生产力提高后可起到减少大气中二氧化碳含量的目的。 

不过,科学家们同时也指出,投放硫酸铁后海中浮游生物会增加,这是否会成为一个新的温室气体来源尚需研究。

下列选项中不属于国际科学小组研究内容的一项是()

A.以硫酸铁为“肥料”促进南极海域微生物的生长以减缓全球变暖的速度

B.向南极海域倾倒硫酸铁

C.向南极海域投放硫酸铁以增加浮游生物数量

D.向南极海域释放硫化六氟化合物示踪剂

阅读理解

阅读理解

     Can dogs and cats live in perfect harmony in the same home? People who are thinking about adopting a dog as a friend for their cat are worried that they will fight.A recent research has found a new recipe for

success.According to the study, if the cat is adopted before the dog, and if they are introduced when still

young (less than 6 months for cats, a year for dogs), it is highly probable that the two pets will get along

swimmingly.Twothirds of the homes interviewed reported a positive relationship between their cat and dog.

However, it wasn't all sweetness and light.There was a reported coldness between the cat and dog in 25% of the homes, while aggression and fighting were observed in 10% of the homes.One reason for this is

probably that some of their body signals are just opposite.For example, when a cat turns its head away it

signals aggression, while a dog doing the same signals submission.

     In homes with cats and dogs living peacefully,  researchers observed a surprising behavior.They are

learning how to talk in each other's language.It is a surprise that cats can learn how to talk 'Dog', and dogs can learn how to talk 'Cat'.

     What's interesting is that both cats and dogs have appeared to develop their intelligence.They can learn to read each other's body signals, suggesting that the two may have more in common than was previously

suspected.Once familiar with each other's presence and body language, cats and dogs can play together,

greet each other nose to nose, and enjoy sleeping together on the sofa.They can easily share the same

water bowl and in some cases groom (梳理) each other.

     The significance of this research on cats and dogs may go beyond pets-to people who don't get along,

including neighbors, colleagues at work, and even world superpowers.If cats and dogs can learn to get

along, surely people have a good chance.

1. The underlined word "swimmingly" in Paragraph 1 is closest in meaning to ________.

A. early                                                                              

B. sweetly                                                                            

C. quickly                                                                            

D. smoothly                                                                          

2. Some cats and dogs may fight when ________.                                        

A. they are cold to each other                                                        

B. they look away from each other                                                    

C. they misunderstand each other's signals                                            

D. they are introduced at an early age                                                

3. What is found surprising about cats and dogs?                                      

A. They eat and sleep together.                                                      

B. They observe each other's behaviors.                                              

C. They learn to speak each other's language.                                        

D. They know something from each other's voices.                                      

4. It is suggested in Paragraph 4 that cats and dogs ________.                        

A. have common interests                                                              

B. are less different than was thought                                                

C. have a common body language                                                        

D. are less intelligent than was expected