在油罐内油层的顶液面下150mm处取样点的样是（）。A、顶样 B、上部样 C、间隙样

41. If it ______ for the fence, he ______ into the river.

A. were not; fallen                                    B. had not been; could have fallen

C were not; could fall                                    D. had not been; could fall

老年性痴呆属于（）

A.神经症性障碍

B.心理发育障碍

C.情感性精神障碍

D.器质性精神障碍

E.成人人格与行为障碍

关于价值观的说法.正确的是()。

A.价值观既是一种个体现象、社会现象，也是靠一种文化现象 

B.价值规随情境不同而改变 

C.价值观不是内隐的，而是外显的 

D.价值观比态度更形象、更具体 

E.价值观对行为具有解释、预测和导向作用

Summer Science Class registration(注册) begins on March 8! If you are interested in science，the environment，or conservation and you are in grades 7－12，sign up soon for Black Rock Forest Consortium's Summer Science Class program.You can download the Summer Science Classes 2013 brochure(手册) here.It is easy to register；just call 845­534­4517 or click here.

Twelve­week­long courses in the natural sciences and the arts are offered at Black Rock Forest in Cornwall from July 15 through August 9.Two more classes are offered with site partners，including “The Art of Scientific Observation，” hosted jointly by Black Rock Forest Consortium and Storm King Art Center，one of the world's leading sculpture parks，and “A Nautical Expedition，” hosted jointly by the Consortium and the Constitution Marsh Audubon Center.

We are delighted to announce two special “away” classes that are part of the Summer Science Class program this year: an “Adirondack Eco­Adventure” beginning August 11，and “Conservation Biology in Florida，” beginning June 23 and featuring field work on the Gulf Coast in cooperation with the University of Florida's Seahorse Key Marine Biological Laboratory.For more information on the Summer Science Class program，please read our press release.

Black Rock Forest Consortium is a nonprofit organization founded in 1989 to advance scientific understanding of the natural world through research，education and conservation programs.

小题1:If you want to be a member of Summer Science Class，you should ________．

A．visit Black Rock Forest first

B．download their brochure

C．call a phone 845­534­4517

D．register before March 8小题2:Summer Science Class's courses are________．

A．only about science subjects

B．cooperated by several organizations

C．from July 15 through August 9

D．hosted by the world's leading professors小题3:Where can you find the article?

A．From a web site.

B．From a traveling brochure.

C．From a novel book.

D．From one famous magazine.

患者，男，60岁，上颌总义齿纵折，主诉修复两年来，纵折三次，检查患者牙槽嵴尚可。下颌弓后部明显大于上颌弓，旧义齿为正常排列，义齿固位良好，边缘伸展适宜。分析原因为（）

A.基托过薄

B.上颌人工牙排列过于偏颊侧

C.咬不平衡

D.基托为塑料基托

E.人工牙为瓷牙