足部按摩所起的作用，最显而易见的是（）A.促进血液循环 B.促进消化 C.促进吸收

滑膜关节具有辅助结构（韧带、关节盘、关节唇），并非每个关节所特有。

下列叙述错误的是（）

A.滑膜关节是骨连接的主要形式

B.滑膜关节相对骨面间有滑液腔隙

C.滑膜关节的骨面相互分离

D.滑膜关节可做旋内运动

E.滑膜关节不能做内收运动

The fact that most Americans live in urban areas does not mean that they reside in the center of large cities. In fact, more Americans live in the suburbs of large metropolitan areas than in the cities themselves.
The Bureau of the Census regards any area with more than 2,500 people as an urban area, and does not consider boundaries of cities and suburbs.
According to the Bureau, the political boundaries are less significant than the social and economic relationships and the transportation and communication systems that integrate a locale. The term used by the Bureau for an integrated metropolis is an MSA, which stands for Metropolitan Statistical Area. In general, an MSA is any area that contains a city and its surrounding suburbs and has a total population of 50,000 or more.
At the present time, the Bureau reports more than 280 MSAs, which together account for 75 percent of the US population. In addition, the Bureau recognizes 18 megapolises, that is, continuous adjacent metropolitan areas. One of the most obvious megapolises includes a chain of hundreds of cities and suburbs across 10 states on the East Coast from Massachusetts to Virginia, including Boston, New York, and Washington, D.C. In the Eastern Corridor, as it is called, a population of 45 million inhabitants is concentrated. Another megapolis that is growing rapidly is the California coast from San Francisco through Los Angeles to San Diego.

According to the passage, where do most Americans live

A．In the center of cities.

B．In the suburbs surrounding large cities.

C．In rural areas.

D．In small towns.

英译汉：“Certificate of cargo G.A.; phytosanitary certificate”，正确的翻译为：( )。

A．共同海损鉴定证书；植物检疫证书

B．海运证书；植物检疫证书

C．共同海损鉴定证书；残损鉴定证书

D．海运证书；残损鉴定证书

工程项目施工图设计主要应根据______进行设计。

A．批准的初步设计文件
B．经评审的初步设计
C．批准的可行性研究报告
D．批准的方案设计

量块为什么既分等又分级，等和级的主要区别是什么？