根据《票据法》规定，持票人应当自收到被拒绝付款的有关证明之日起( )内，将被拒绝事

某国有企业拟投资5亿元建设高档酒店，酒店用地使用权由出让式获得。在开挖地基过程中，发现地下有大量埋藏物。

该国有企业获取土地使用权可能的方式有（）

A.招标 

B.拍卖 

C.挂牌 

D.划拨

光合作用释放的氧来自参与光合作用的水，因此水是光合作用不可缺少的原料。[ ]

面对具有威胁性的突发事件，恐慌心理是人们进行自我保护的本能反应。但是，过度的恐慌反应，常常会导致比事件危害本身更为严重的消极后果。经验显示，在突发性公共事件中，许多损失可能不是事件本身造成的，而是由于人们的过度恐慌导致的。这段文字意在强调（）。

A．产生恐慌心理是人们在突发事件中的正常反应

B．在突发性公共事件中，人们的损失往往是自己造成的

C． 突发事件发生时，人们其实不必慌张

D．面对突发事件，人们应尽量保持稳定的心态

如图所示的气缸中封闭着一定质量的理想气体，活塞和气缸间都导热，活塞与气缸间无摩擦，气缸开口始终向上.在室温为27°时，活塞距气缸底部距离h₁=10cm,后将气缸放置在冰水混合物中，则：

①在冰水混合物中，活塞距气缸底部距离h₂=？

②此过程中气体内能        （填“增大”或“减小”），气体不对外做功，气体将          (填“吸热”或者“放热”) .

Although there are many skillful Braille readers, thousands of other blind people find it difficult to learn that system. They are thereby shut (1) from the world of books and newspapers, having to (2) on friends to read aloud to them.

A young scientist named Raymond Kurzweil has now designed a computer which is a major (3) in providing aid to the (4) .His machine, Cyclops, has a camera that (5) any page, interprets the print into sounds, and then delivers them orally in a robot-like (6) through a speaker. By pressing the appropriate buttons (7) Cyclops’s keyboard, a blind person can "read" any (8) document in the English language.

This remarkable invention represents a tremendous (9) forward in the education of the handicapped. At present, Cyclops costs $ 50,000. (10) , Mr. Kurzweil and his associates are preparing a smaller (11) improved version that will sell (12) less than half that price. Within a few years, Kurzweil (13) the price range will be low enough for every school and library to (14) one. Michael Hingson, Director of the National Federation for the Blind, hopes that (15) will be able to buy home (16) of Cyclops for the price of a good television set.

Mr. Hingson’s organization purchased five machines and is now testing them in Maryland, Colorado, Iowa, California, and New York. Blind people have been (17) in those tests, making lots of (18) suggestions to the engineers who helped to produce Cyclops.

"This is the first time that blind people have ever done individual studies (19) a product was put on the market," Hingson said. "Most manufacturers believed that having the blind help the blind was like telling disabled people to teach other disabled people. In that (20) , the manufacturers have been the blind ones.

19（）

A.after

B.when

C.before

D.as