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问题 多项选择题

下列对于资本主义社会的历史作用的认识正确的（）

A.有明显的双重性    

B.有进步的一面，又带有非人的罪恶的一面

C.素了漫长的封建社会的黑暗统治，具有重大的积极意义

D.大的提高了社会的物质生产力和科技生产力

E.成道德败坏和两极分化，导致了人类的异化和人文精神的堕落

答案

参考答案：A, B, C, D, E

单项选择题

Yellowstone Weather
Yellowstone National Park is at high altitude. Most of the park is above 7,500 feet (2,275 meters).
Yellowstone’s weather is unpredictable. In summer, it may be warm and sunny with temperatures in the high 70F. At night in any given month, the temperature may drop close to freezing. So it is best to come prepared for cold evenings and mornings, especially if you are camping or hiking. When you leave your campsite, please leave it prepared for possible thundershowers and wind.
A sunny warm day may become fiercely stormy with wind, rain, sleet and sometimes snow. Without enough clothing, an easy hike or boat trip can turn into a battle for survival.
Seasonal Weather Information
Spring
Cold and snow continue into May, although temperatures gradually climb Early in spring, daytime temperatures average in the 40F to 50F; by late May and June, they may reach the 60F and 70F. Nighttime lows fall below freezing.
Summer
Daytime temperatures are usually in the 70F, occasionally reaching the 80F in the lower elevations (高度). Nights are cool, temperatures may drop in the 40F and 30F—sometimes even the 20F. June can be cool and rainy; July and August tend to be somewhat drier, although afternoon thundershowers are common.
Fall
Weather can be pleasant, although temperatures average 10-20 degrees lower than summer readings. Nighttime lows can fall into the teens and lower. Snowstorms increase in frequency as the weeks go by or towards the end of the fall season.
Winter
Temperatures often stay near zero throughout the day, occasionally reaching high in the 20F. Subzero nighttime lows are common. Annual snowfall averages nearly 150 inches in most of the park. At higher places, 200 -400 inches of snow have been recorded.

The author writes this passage most probably for those who plan to ______ in Yellowstone National Park.

A．do research work

B．take a business trip

C．have sports games

D．spend their holidays or take a tour
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填空题

画单个圆柱齿轮时，应使齿轮轴线为（），其主视图通常画成（），但轮齿按（）处理。
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