办理退房结帐手续是宾客离店前所接受的最后一项服务，一般要求（）完成A、5分钟 B、2—

所谓概念模型，指的是______。

A．客观存在的事物及其相互联系

B．将信息世界中的信息进行数据化

C．实体模型在计算机中的数据化表示

D．现实世界到机器世界的一个中间层次，即信息世界

Starting in l972，the National Park Service established a policy for forest fires calle Natural Burn．It was acknowledged that some forest fires，such as those caused by lightning were necessary for forests to maintain balanced ecosystems，so the fire should be allowed to burn．However, a big fire in Yellowstone National Park in l988 caused this policy to be abandoned since the fire was initially allowed to burn yet soon out of control．As a result，the fire of l988 destroyed much of Yellowstone，which is America’s oldest and most beloved national park．Massive areas of plants were destroyed，and large empty spaces and acres of burned and blackened trees greeted visitors．The rivers and streams were choked with ash，and the ecosystem of the park was changed beyond repair.

In addition，great numbers of animals were killed by the fires that bumed out of control. The fires were driven by high winds，moving as many as ten miles a day．Many small animals died in the flames．The fires’ rapid advances gave the wildlife little chance to escape. Even today，few of these small forest animals have returned to live in the park. In the years immediately following the fires，the numbers of visitors declined rapidly．No one was interested in seeing a blackened and treeless park on vacation．Yellowstone had previously been famous for its amazing views and unique geological formations such as the geyser Old Faithful. But now its reputation as America's wonder is damaged permanently.

小题1:Natural Burn was adopted because some forest fires were        

A．hard to put out

B．started by lightning

C．good for the balance of nature

D．approved by National Park Service小题2:The big fire in Yellowstone in 1988         ．

A．became out of control at first

B．destroyed the park completely

C．was allowed to burn continuously

D．brought the natural burn policy to an end小题3:Why were so many animals killed in the big fire?

A．Because winds were blown from high places．

B．Because the animals moved only ten miles a day．

C．Because the animals lived in lower places．

D．Because strong winds contributed to the fire a lot．小题4:Yellowstone was famous for its        ．

A．rare animals

B．unique plants

C．beautiful scenery

D．little streams小题5:The text probably comes from   ．

A．a science fiction

B．a news report

C．a commercial ad

D．a geography magazine

进一步审计程序是相对于风险评估程序而言的，是指注册会计师针对评估的各类交易、账户余额和披露认定层次重大错报风险实施的审计程序，包括()。

A.控制测试和实质性程序

B.风险评估程序和控制测试

C.风险评估程序和实质性程序

D.风险评估程序和分析程序

洋葱是常用的实验材料，下列说法中不正确的是（）。

A.观察有丝分裂实验中，剪取洋葱根尖2～3cm制作装片

B.观察质壁分离实验中，选用紫色洋葱鳞片叶外表皮细胞做材料

C.观察叶绿体实验，不能选洋葱鳞片叶内外表皮细胞做材料

D.观察DNA、RNA的分布实验，可选洋葱内表皮细胞做材料

下列说法错误的是

A．可以采用图片作为悬停按钮

B．网页中的横幅广告类似于幻灯片的播放，但横幅广告不能插入超链接

C．插入站点计数器后切换到预览窗口即可看到效果

D．通过组件中的Java小程序可以插入Flash动画