In the past, the Park Service focused on making the big scenic parks more 【21】______ and comfortable for tourists. Roads were paved to allow "windshield visitors" to experience the grandeur of nature without leaving their cars, and a 【22】______ number of hotels and grocery stores were permitted to open 【23】______ the park boundaries.
Now this trend is changing. Plans have been made to 【24】______ the parks to their natural condition as much as possible. The objective of such a move would be to secure the preservation of the parks for future generations, 【25】______ allowing present-day visitors to experience pure wilderness, 【26】______ from any obvious signs of civilization -- an opportunity which is quickly disappearing in the twentieth century. 【27】______ plans call only 【28】______ a reduction in the number of cars 【29】______ into the parks each day, but 【30】______ , tourists may have to leave their cars at the gates and then either visit the park on foot 【31】______ use park 【32】______ 【33】______ , stores and hotels may no longer be allowed within park boundaries and even the number of campgrounds may be restricted.
Denali National Park in Alaska serves as an excellent 【34】______ for this new type of park, one which has been changed only slightly from its 【35】______ state. There is only one road, unpaved in 【36】______ , which cross 【37】______ Denali. As car traffic is strictly limited, many visitors experience the magnificent 【38】______ and wildlife from a park bus. There are no hotels or stores and only seven campgrounds within Denali's 3,000 square miles. This 【39】______ isolation offers backpackers, canoeists, and other sport enthusiasts a 【40】______ physical and psychological challenge.
【21】
A.possible
B.accessible
C.approachable
D.reachable
第1题
下列关于门静脉的描述,哪项是错误的?()
A.未阻断的情况下,门静脉压的正常值约在13~24cmH2O
B.门静脉压力增高时首先出现的是交通支扩张
C.门静脉主干由肠系膜上静脉和脾静脉汇合而成
D.门静脉与腔静脉之间的交通支最主要的是胃底、食管下段交通支
E.门静脉无瓣膜
第2题
下列关于门静脉的描述,哪项是错误的?()
A.未阻断的情况下,门静脉压的正常值约在13~24cmH2O
B.门静脉压力增高时首先出现的是交通支扩张
C.门静脉主干由肠系膜上静脉和脾静脉汇合而成
D.门静脉与腔静脉之间的交通支最主要的是胃底、食管下段交通支
E.门静脉无瓣膜
第3题
A.未阻断的情况下,门静脉压的正常值约在13~24cmH2O之间
B.门静脉压力增高时首先出现的是交通支扩张
C.门静脉主干是由肠系膜上静脉和脾静脉汇合而成
D.门静脉无瓣膜
第4题
下列关于门静脉的描述,错误的是()。
A.未阻断的情况下,门静脉压的正常值约在13~24cmH2O
B.门静脉压力增高时首先出现的是交通支扩张
C.门静脉主干由肠系膜上静脉和脾静脉汇合而成
D.门静脉与腔静脉之间的交通支最主要的是胃底、食管下段交通支
E.门静脉无瓣膜
第5题
下列关于门静脉的描述,哪项是错误的?()
A.在未阻断的情况下,门静脉压的正常值在13~24cmH2O
B.在门静脉压力增高时首先出现的是交通支扩张
C.门静脉主干是由肠系膜上静脉和脾静脉汇合而成
D.门静脉与腔静脉之间的交通支最主要的是胃底、食管下段交通支
第6题
A.未阻断的情况下,门静脉压的正常值约在13~24cmH2O之间
B.门静脉压力增高时可出现交通支扩张、腹水等
C.门静脉主干是由肠系膜上静脉和脾静脉汇合而成
D.门静脉与腔静脉之间的交通支最主要的是腹膜后交通支
E.门静脉无瓣膜
第7题
A.未阻断的情况下,门静脉压的正常值约在13~24cmH20之间
B.门静脉压力增高时可出现交通支扩张、腹水等
C.门静脉主干是由肠系膜上静脉和脾静脉汇合而成
D.门静脉与腔静脉之间的交通支最主要的是腹膜后交通支
E.门静脉无瓣膜
第8题
A.未阻断的情况下,门静脉压的正常值约在13~24cmHO之间
B.门静脉压力增高时首先出现的是交通支扩张
C.门静脉主干是由肠系膜上静脉和脾静脉汇合而成
D.门静脉与腔静脉之间的交通支最主要的是胃底、食管下段交通支
E.门静脉无瓣膜
第9题
下列关于肝门静脉的描述,哪项是不正确的
A.肝门静脉压力增高时可出现交通支扩张、腹水等
B.未阻断的情况下,肝门静脉压的正常值 13~24cmH2O
C.肝门静脉主干是由肠系膜上静脉和脾静脉汇合而成
D.肝门静脉与腔静脉之间的交通支最主要的是腹膜后交通支
E.肝门静脉无瓣膜
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