竞争法一般用于检测（）。A、小分子抗原B、抗体C、大分子抗原

用计算器时，一道题计算完成后，只要按oN／c键就可以进行另一道题的计算。[ ]

下列句子中没有语病的一项是                                     

A．小说《祝福》的故事实际是两个线索的展现过程，其中直接呈现于读者的故事线索是主人公祥林嫂对于困境的逐渐陷入。

B．他们避居在穷山僻壤之间，托庇于大自然的保护，就在沉浸物我交融的恍惚状态的同时，那种理智的分析能力难免就显得薄弱多了。

C．孙犁生前曾受到过这方水土的养育，他在小说《荷花淀》中，又让白洋淀美丽的荷花，醉倒了无数读者，使白洋淀的名字香飘世界。

D．就以沈从文为例吧，我们看他的身世、自传就能够知道，他的全部描写湘西生活的作品也都在作证：他是一个颇为独特的作家。

患者女性，40岁，半年来口腔反复疼痛、“溃疡”就诊，半年来患者有反复低热，原因不明。检查可见患者消瘦，慢性病容，口内颊黏膜、舌黏膜、腭黏膜大量灰白色假膜，易撕下，遗留浅层糜烂或渗血的表面，牙龈红肿，部分龈缘糜烂

如果上题的检查呈阳性，患者可诊断为

A．急性假膜型白念珠菌病
B．急性萎缩型白念珠菌病
C．慢性萎缩型白念珠菌病
D．慢性增殖型白念珠菌病
E．慢性黏膜皮肤念珠菌病

                                                   American Way of Life

     Throughout their history, Americans have been people on the move. The early immigrants had

to travel to get to the New World. Once they arrived, they settled along the East Coast. But they

weren't content to stay there.   1   Later, settlers moved west to develop these new areas. As a result

of this westward migration, Americans eventually occupied the whole continent from the Atlantic to

the Pacific. Even today, Americans seem unable to stay in one place. Research says that the average

American moves every five years.

     Besides their habit of changing addresses, Americans are used to traveling. Some people go to

work daily in long-distance places. __2__ Most companies provide an annual vacation for their

employees, and people often use that time to travel. Some people just visit friends or relatives in

distant states. Others go on low-budget weekend outings and stay in economy motels. Those with

more expensive tastes choose fancy resorts and hotels.   3   Some travel in vehicles to camp out in

comfort while others "rough it" by sleeping in tents. 

         4   Why? For one thing, it's cheaper than traveling abroad and there's no language problem.

Besides, America offers plenty of tourist attractions. _5_ Nature lovers can enjoy beaches, mountains,

canyons, lakes and a wealth of natural wonders. As it is, the convenience of modern freeways, railways

and airplanes makes travel in America as easy as pie.

A. Families often plan their trips with the kids in mind.

B. Most Americans prefer to travel within their nation's borders.

C. Explorers and traders journeyed to the unknown western areas.

D. Major cities offer visitors large quantities of urban delights.

E. Many people ask traveling agencies to plan the trip for them.

F. Their jobs may even require them to take regular business trips.

G. For adventurous people, camping out in the great outdoors is appealing.

在某数据库中有一张数据库表，该表中的某字段已包含有重复数据，则在该字段上能够指定下列的______索引。 ①候选索引 ②主索引 ③普通索引 ④唯一索引

A．①②④

B．②③④

C．①②③

D．③④