高压交联聚乙烯电力电缆有哪些优缺点？

如图所示，某十字路口有一交通指挥灯，内有红绿黄三盏灯，每盏灯额定功率40W，额定电压220V，现保证每盏灯发光时都能正常发光，且每次只是一盏灯亮，则该指挥灯连续工作5小时，每盏的电阻为______Ω，共耗电______度．

关于有机化学实验说法正确的是（   ）

A．用C₈H₁₈萃取溴水中的溴，可观察到溶液分层，上层为橙红色，下层接近无色

B．热的苯酚浓溶液放入冷水中冷却，溶液变浑浊，此时发生了化学反应

C．石油的分馏和煤的干馏都属于物理变化

D．采用分液的方法分离甘油与水

选择填空。

My mother works ______ a farm ______ my home. [ ]

A. in; at

B. on; near

C. on; at

     The owls (猫头鹰) were not what they seem, or so many people seem to think ...

     For centuries, owls have been feared and seen as signs of evil or death.But they are also seen as

symbols of intelligence. The bird's ability to see well in the night means that it is closely associated with

Athena, the Greek goddess of wisdom, She is frequently  described as an owl perched (栖息) on her

head.

     So humanized owls are often used to indicate that someone is intelligent and educated - a pair of

eyeglasses or a mortarboard, the square, flat cap worn by college graduates. According to an article in

The Guardian, owls are among the most popular birds in British culture. You see them in Harry Potter

series, delivering letters and parcels. They are also the stars of Legend of the Guardians, a 3D animated

film that cam out on September 24, 2010.

     Mark Cocker, a columnist (专栏作家) with the paper, notes that many TV dramas use owls. Why?

The answer, according to Cocker, is that owls belong to nighttime. It's a time of mystery. Owls fly in

silence, kill small animals for food and scream with a terrible voice. These facts made people associate

the birds with the dark and dangerous.

     Cocker believes that it is this "slight tremble of danger" that means the bird is often found on T-shirts

and bags. "Of all widespread British birds, they are still the species we hear most, but see the least,"

writes Cocker. "The owl reminds us as we lie in our beds that in the darkness…is a life and a beating

heart that we can never quite know."

1. Owls are regarded as symbols of intelligence mainly because ______.

A. they can see very well

B. they are connected with Athena

C. they are able to deliver letters and parcels

D. they remind us what college graduates wear

2. According to Mark Cock, many TV dramas use owls because ______.

A. they scream with a frightful voice at night

B. British people are familiar with them

C. they create a feeling of mystery and danger

D. they awake the desire to take risks

3. The underlined word "the paper" in Paragraph 6 most probably refers to ______.

A. The Guardian                    

B. Harry Potter

C. Legend of the Guardians            

D. Athena

4. What is the writing purpose of this passage?

A. To explain why owls are so associated with evil or death.

B. To analyze why owls are so common in British culture.

C. To tell readers not to be afraid of owls.

D. To recommend some movies related to owls.

曾任中国文学系教授，在中国第一个把马克思主义的观点和方法带进汉语修辞领域的学者是谁？