已知双曲线 $\frac{x^2}{a^2}-\frac{y^2}{b^2}=1$ （a＞0，b＞0）的两条渐近线与抛物线y²=4x的准线分别交于A，B两点，O为坐标原点，若双曲线的离心率为2，则△AOB的面积为（   ）

国家统计局发布的最新数据显示：目前，我国非公有制经济对第三产业（尤其是服务行业）的贡献率超过70%，前年非公有制经济利润总额达到1.82万亿。这说明非公有制经济（   ）

    People have all turned to sad music to make themselves feel better at some point in their lives, ____why does the music with double or even triple sadness help drag people out of low spirits?

    A new study throws light on what's going on inside people's brains when they match their music to their feelings, and it looks as if sad music can be enjoyable, rather than____(simple) depressing. Music of this sort can arouse positive memories in people's life , thus ____(lift)their mood.

    Psychologist Adrian North from Curtin University in Australia says there____(existence) two groups of possible explanations for why people enjoy listening to sad music like this---one from social psychology, and the other from cognitive neuroscience(神经学).

    ____terms of social psychology, one idea about this is that people will feel____(good) about themselves if they focus on someone who's doing even worse. Everything's going to be okay, because this person is having ____even worse day than they are.

    Another idea from social psychology is that people like to listen to the very music____shows their present life circumstances, because this kind of music makes them feel they are understood. With their emotions____(share), they definitely get a certain amount of comfort.

    So, the____(conclude) again—sad music does cheer people up, and it works far better than happy music, in most cases.

    The extraordinary Eastgate Building in Harare, Zimbabwe's capital city, is said to be the only one in the world to use the same cooling and heating principles as the termite mound (白蚁堆).

    Architect Mick Pearce used precisely the same strategy when designing the Eastgate Building, which has no air conditioning and almost no heating. The building is the country's largest commercial and shopping complex but uses less than 10% of the energy of a conventional building of its size. The Eastgate's owners saved 3.5 million on a 36 million building because air conditioning didn't have to be equipped.

    The complex is actually two buildings linked by bridges across a shady, glassroofed atrium (天井) open to the air. Fans suck fresh air in from the atrium, blow it upstairs through hollow spaces under the floors and from there into each office through vents (通风口). As it rises and warms, it is drawn out via ceiling vents and finally exists through fortyeight brick chimneys.

    During summer's cool nights, big fans blow air through the building seven times an hour to cool the empty floors. By day, smaller fans blow two changes of air an hour through the building to circulate the air which has been in contact with the cool floors. For winter days, there are small heaters in the vents.

    This is all possible only because Harare is 1,600 feet above sea level, and has cloudless skies, little dampness and rapid temperature swings-days as warm as 31 °C commonly drop to 14°C at night. “You couldn't do this in New York, with its fantastically hot summers and fantastically cold winters,” Pearce said.

    The engineering firm of Ove Arup & Partners monitors daily temperatures. It is found that the temperature of the building has generally stayed between 23 °C and 25 °C, with the exception of the annual hot period just before the summer rains in October and three days in November, when a doorkeeper accidentally switched off the fans at night. And the air is far fresher than in airconditioned buildings, where up to 30% of the air is recycled.