搜题请搜索小程序“爱下问搜题”
问题 单项选择题

食管癌术后恢复期应采用的饮食为（）

A.普通膳食

B.高脂肪膳食

C.低蛋白软食

D.高蛋白、富含维生素、低脂软食

E.高蛋白、高脂肪软食

答案

参考答案：D

填空题

（普高完成）四种短周期元素的性质或结构信息如下表．请根据信息回答下列问题．

元素ABCD
性质或

结构

信息

室温下单质为黄色粉末状固体，加热易熔化；单质在氧气中燃烧，发出明亮的蓝紫色火焰，产生有刺激性气味的气体单质常温、常压下是气体，能溶于水；原子的M层上有7个电子单质质软、银白色固体、导电性强；单质在空气中燃烧发出黄色的火焰，生成淡黄色的固体原子最外电子层有4个电子；其单质既能与酸反应，又能与碱反应
（1）B元素在周期表中的位置是______，写出C与氧气燃烧后产物的电子式______．

（2）写出C单质与水反应的化学方程式______．A与氢元素形成的化合物溶于水后，溶液的pH______7（填“大于”“等于”或“小于”）．

（3）D与酸反应的化学方程式为______与NaOH反应的离子方程式为______．

（4）A、B两元素非金属性较强的是（写元素符号）______．写出其最高价氧化物对应水化物的酸性强弱______．（用化学式表示）
查看答案
单项选择题

Passage Two

Although the American civilization took over and replaced the frontier over a century ago, the heritage of the frontier is still evident in the United States today. Many people are still fascinated by the frontier because it has been particularly important in shaping American values. For many years, the frontier experience was romanticized in popular movies and television shows that featured cowboy heroes fighting Indian villains. Little attention was given to the tragic story of what really happened to Native Americans. Today, most Americans are more aware of the darker side of the settling of the continent, when thousands of Native American Indians were killed, their lands were taken, and much of their culture was destroyed.
The American frontier consists of the relatively unsettled regions of the United States, usually found in the western part of the country. Here, both land and life were more rugged and primitive than in the more settled eastern part. As one frontier area was settled, people began moving farther west into the next unsettled area, sweeping aside the Native Americans as they went. By settling one frontier area after another, Americans moved across an entire continent, 2 700 miles wide. They came to believe that it was their destiny to control all the land, and eventually they did. The Native Americans were given small portions of land called reservations to control, but the United States government broke many promises and created much misery for the Indian nations.
Recently, Americans have come to a more balanced view of the settling of the West. However, many Americans still see many aspects of the frontier, its people and their beliefs, as good, inspiring examples of traditional American values in their original and purest form. How did the frontier movement, which lasted more than two centuries, help to shape these basic American values
To be sure, the frontier provided many inspiring examples of hard work as forests were turned into towns, and towns into large cities. The competitive race for success was rarely more colorful or adventurous than on the western frontier. Individualism, self-reliance, and equality of opportunity have perhaps been the values most closely associated with the frontier heritage of America. Throughout their history, Americans have tended to view the frontier settler as the model of the free individual. In the United States, where freedom from outside social controls has traditionally been valued, the frontier has been idealized, and it still serves as a basis for a nostalgic view of the early United States, a simpler time that was lost when the country became urbanized and more complex.

One reason why many Americans are still fascinated by the frontier is that ______ .

A．the frontier area is more civilized and developed than other parts of the country

B．the frontier experience is greatly romanticized in today’s popular movies and TV shows

C．the frontier period represents a time when the traditional basic Americans values were expressed in their purest form

D．the lifestyle of the Native American Indians who live in the frontier area is still mysterious and appealing
查看答案