路堤是开挖形成的，而路堑是填筑形成的。

1908年，美国底特律工人们首次用大批量生产的部件在流水线上组装（）。

从海陆分布角度来看，我国属于（　　）

A．海陆兼备之国

B．内陆国

C．岛国

D．半岛国家

锅炉运行中节能要点是（）

A.锅炉按额定负荷运行

B.及时消除受热面积灰

C.加强保温、堵漏防泄冒

D.确保锅炉给水合格

Selection to participate in a top executive-education program is an important rung on the ladder to top corporate jobs. U. S. corporations (1) billions of dollars in this form of management development -- and use it to (2) and train fast-track managers. Yet one (3) of executive education found that less than 5% of the managers (4) to these high-profile programs are women -- and minorities are terribly (5) as well.

The numbers are (6) . In regular business (7) usually paid for by the participant, not an employer -- there are plenty of women and minorities. Women, for example, (8) for about 30% of MBA candidates. Yet in the (9) programs paid for by corporations that round out a manager’s credentials at a (10) career point, usually at age 40 or 45, companies are making only a (11) investment in developing female and minority executives. A case (12) point: Only about 30% of the 180 executives in Stanford’s recent (13) management program were women.

Most companies say these days they are (14) hiring and promoting women and minorities-- and there are some (15) trends in overall employment and pay levels so why are companies (16) the ball when it (17) executive education The schools (18) that they are neither the cause of nor the cure for the problem. A Harvard Business School dean figures that companies are (19) of sending their female executives (20) they don’t want to lose them to competitors.

12（）

A. beside

B. up to

C. in

D. to

环境管理体系可以确保环境绩效的持续改进。（）