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M: We’re going to the pond to skate and sled. Do you want to come with usW: Thanks, but it’s below zero, so I’ll stay near the fire. What time of the year does the conversation take place（）
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新生儿呼吸窘迫综合征
The rocket engine, with its steady roar like that of a waterfall or a thunderstorm, is an impressive symbol of the new space age. Rocket engines have (76) powerful enough to shoot astronauts (77) the earth’s gravitational pull and (78) them on the moon. We have now become (79) in space. Impressive and complex (80) it may appear, the rocket, which was (81) in China over 800 years (82) , is a relatively simple device. Fuel that is (83) in the rocket engine changes (84) gas. The hot and rapidly (85) gas must escape, but it can do so only through an opening that faces backward. As the gas is radiated with great force, it pushes the rocket in the opposite direction.
Russian-born Max Weber grew up in New York, studied art there, and then went back to Europe to familiarize himself with contemporary artistic developments, on returning to the United States, Weber worked in the new styles he had discovered in Paris and soon became recognized as a pioneer of American abstract painting. An example of his work at the National Gallery of Art in Washington D. C. is a 1915 painting entitled "Rush Hour, New York. " Using abstract, geometrical forms, Weber has expressed the movement, noise, and vibrancy of the great metropolis. The picture blends elements of two European styles: cub- ism, which shows subjects from a number of different angles of vision at the same time, and futurism, which portrays speed and objects in motion. Forceful lines and spiky forms throughout the composition convey the energy and vitality of the city, Weber expresses the city’s diversity by juxtaposing forms with rounded and angular shapes to suggest specific elements of the urban landscape: skyscrapers, flashing lights, and hurrying people. According to the passage, Weber uses the style of cubism when he（）
典型急性菌痢患者的大便特点为
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