目前广泛使用的主要安全技术包括（）。 A.防火墙 B.入侵检测 C.PKI D.VP

进出口货物的收发货人或其代理人应在( )向指定的银行缴纳税款。

A．海关填发税款缴纳书之日起15日内(星期六、日和法定节假日除外)

B．海关填发税款缴纳书之日起15日内(星期六、日和法定节假日不除外)

C．海关填发税款缴纳书之日起7日内(星期六、日和法定节假日除外)

D．海关填发税款缴纳书之日起7日内(星期六、日和法定节假日不除外)

某学生将食盐、生石灰、米醋、酸奶分别放入等质量的水中，逐一进行了pH的测定，并表示在下面的数轴上，其中能表示生石灰溶于水形成溶液的PH的是（　　）

A．A

B．B

C．C

D．D

政府制定最低工资线的政策是由于哪种组织的影响？（）

A.金融机构

B.工会

C.国有公司

D.商会

市区是城市的核心，集中了大量的( )。

A．非农人口

B．第一产业

C．第二产业

D．第三产业

E．开发建设区

In the early 1960s Wilt Chamberlain was one of the only three players in the National Basketball Association (NBA) listed at over seven feet. If he had played last season, however, he would have been one of 42. The bodies playing major professional sports have changed dramatically over the years, and managers have been more than willing to adjust team uniforms to fit the growing numbers of bigger, longer frames.

The trend in sports, though, may be obscuring an unrecognized reality: Americans have generally stopped growing. Though typically about two inches taller now than 140 years ago, today’ s people—especially those born to families who have lived in the U. S. for many generations--apparently reached their limit in the early 1960s. And they aren’t likely to get any taller. "In the general population to- day, at this genetic, environmental level, we’ve pretty much gone as far as we can go," says anthropologist William Cameron Chumlea of Wright State University. In the case of NBA players, their in- crease in height appears to result from the increasingly common practice of recruiting players from all over the world.

Growth, which rarely continues beyond the age of 20, demands calories and nutrients—notably, protein—to feed expanding tissues. At the start of the 20th century, under-nutrition and childhood infections got in the way. But as diet and health improved, children and adolescents have, on average, increased in height by about an inch and a half every 20 years, a pattern known as the secular trend in height. Yet according to the Centers for Disease Control and Prevention, average height—5’9" for men, 5’4" for women—hasn’t really changed since 1960.

Genetically speaking, there are advantages to avoiding substantial height. During childbirth, larger babies have more difficulty passing through the birth canal. Moreover, even though humans have been upright for millions of years, our feet and back continue to struggle with bipedal posture and can- not easily withstand repeated strain imposed by oversize limbs. "There are some real constraints that are set by the genetic architecture of the individual organism," says anthropologist William Leonard of Northwestern University.

Genetic maximums can change, but don’t expect this to happen soon. Claire C. Gordon, senior anthropologist at the Army Research Center in Natick, Mass. , ensures that 90 percent of the uniforms and workstations fit recruits without alteration. She says that, unlike those for basketball, the length of military uniforms has not changed for some time. And if you need to predict human height in the near future to design a piece of equipment, Gordon says that by and large, "you could use today’s data and feel fairly confident.\

We learn from the last paragraph that in the near future（）

A. the garment industry will reconsider the uniform size

B. the design of military uniforms will remain unchanged

C. genetic testing will be employed in selecting sportsmen

D. the existing data of human height will still be applicable