问题 单项选择题

下列除哪项外,均可选择胸部X线检查进行鉴别

A.胸腔积液是血性或脓性
B.大叶性肺炎或支气管肺炎
C.气胸或肺大疱
D.肺不张或肺实变
E.肺脓肿或肺肿瘤

答案

参考答案:A

解析:X线成像的原理是根据人体结构的密度或厚度不同,对X线的吸收不同,而形成不同灰度的影像。而A项中血性胸腔积液和脓性胸腔积液在密度上差别不大,在 X线检查上不易区分,可做胸腔积液检查更清楚的鉴别。
[考点] X线检查的应用范围。

判断题
单项选择题

More surprising, perhaps, than the current difficulties of traditional marriage is the fact that marriage itself is alive and thriving. As Skolnick notes, Americans are a marrying people: Relative to Europeans, more of us marry and we marry at a younger age. Moreover, aster a decline in the early 1970s, the rate of marriage in the United States is now increasing. Even the divorce rate needs to be taken in this pro-marriage context: some 80 percent of divorced individuals remarry. Thus, marriage remains, by far, the preferred way of life for the vast majority of people in our society.

What has changed more than marriage is the nuclear family. Twenty-five years ago, the typical American family consisted of a husband, a wife, and two or three children. Now, there are many marriages in which couples have decided not to have any children. And there are many marriages where at least some of the children are from the wife’s previous marriage, or the husband’s, or both. Sometimes these children spend all of their time with one parent from the former marriage; sometimes they are shared between the two former spouses.

Thus, one can find the very type of family arrangement. There are marriages without children; marriages with children from only the present marriage; marriages with "full-time" children from the present marriage and "part-time" children from former marriages. There are step-fathers, step-mothers, half-brothers, and half-sisters. It is not all that unusual for a child to have four parents and eight grandparents! These are enormous changes from the traditional nuclear family. But even so, even in the midst of all this, there remains one constant: Most Americans spend most of their adult lives married.

Which of the following can be presented as the picture of today’s American families()

A. A typical American family consists of only a husband and a wife

B. Many types of family arrangements have become socially acceptable

C. Americans prefer to have more kids than before

D. There are no nuclear families any more