阅读下列材料，并请回答问题。 材料一：秦统一文字秦统一货币（1）根据材料一，结合

一几何体的三个视图都是面积为2的圆，则这个几何体的表面积是（　　）

A．4

B．2

C．8

D．16

暑假期间，小明要从天津乘船到海南省的海口市，依次经过的海域是[ ]

A．渤海黄海东海南海

B．渤海黄海南海东海

C．南海渤海黄海东海

D．东海南海渤海黄海

下列各句中，加粗的成语使用不恰当的一句是[ ]

A．那时候，电脑“黑客”宁愿把自己披肝沥胆创造出来的程序慷慨地与大家分享，得到一种精神上的满足——不过，他们也并不比那些抄袭拷贝别人程序的人高明多少。

B．比尔和保罗·艾伦编写BASIC程序来适应市场上各式各样的新电脑，因为各种牌子的电脑千差万别，每种都需要特有的BASIC程序软件。

C．虽然当时加利福尼亚州的硅谷已经蒸蒸日上，吸引了全球的目光，很多电脑公司都在那儿打出旗号，但比尔与父母一向关系亲密，认为不应该远离老盖茨夫妇。

D．他也放了自己4天假，到澳大利亚去旅行，返回公司后仍是一如既往地从早忙到晚。

The United States has historically had higher rates of marriage than those of other industrialized countries. The current annual marriage (51) in the United States—about 9 new marriages for every 1,000 people—is (52) higher than it is in other industrialized countries. However, marriage is (53) as widespread as it was several decades ago. (54) of American adults who are married (55) from 72 percent in 1970 to 60 percent in 2002. This does not mean that large numbers of people will remain unmarried (56) their lives. Throughout the 20th century, about 90 percent of Americans married at some (57) in their lives. Experts (58) that about the same proportion of today’s young adults will eventually marry.

The timing of marriage has varied (59) over the past century. In 1995 the average age of women in the United States at the time of their first marriage was 25. The average age of men was about 27. Men and women in the United States marry for the first time at an average of five years later than people did in the 1950s. (60) , young adults of the 1950s married younger than did any previous generation in U. S. history.

59().

A.unexpectedly 

B.irregularly 

C.flexibly 

D.consistently

对病因不明疾病的研究中，描述性研究的主要用途是

A．早期发现患者

B．早期诊断患者

C．早期治疗患者

D．提出病因假说

E．检验病因假说