阅读下文，完成文后各题。 给蚂蚁打伞 那是个闷热的傍晚，天阴着，没有风，知了的叫

患者，女性，36岁。渐进性双耳听力下降伴耳鸣十年，育有两子。检查鼓膜完整，标志清楚。

对该病治疗描述正确的是（）。

A.口服氟化钠可抑制病灶形成

B.对于病变广泛，发展迅速的病例，优先考虑氟化剂治疗

C.对于妊娠期病情恶化病例亦可选择氟化钠口服

D.佩戴助听器

E.对精神忧郁或烦躁者可给予安慰及镇静药物

F.镫骨手术及外半规管开窗术可以恢复或改善因镫骨固定而造成的传音障碍

不是扁平苔藓口腔表现的是（）

A.糜烂

B.水疱

C.丘疹

D.斑块

E.皲裂

下列关于公开发行证券的说法中，错误的是（）。

A.申请文件置备于指定场所供公众查阅

B.改变招股说明书所列资金用途，必须经股东大会作出决议

C.股票依法发行后，发行人经营与收益的变化，由发行人自行负责

D.公开发行公司债券筹集的资金可以用于弥补亏损和非生产性支出

分析激活具体工单时，以下哪几种方法可以查看上游系统传送给激活的XML报文（）。

A.工单类型选母单，输入母单号点击“查看XML"按钮即可查看

B.工单类型选子单，输入子单号点击“查看XML"按钮即可查看

C.通过工单查询结果的工单详细P试图点击工单标识即可查看

D.点击工单查询结果的工单详细T试图左上角的“查看XML报文”即可查看

In the two decades between 1910 and 1930, over ten percent of the Black population of the United States left the South, where the majority of the Black population had been located, and migrated to northern states, with the largest number moving, it is claimed, between 1016 and 1918. It has been frequently assumed, but not proved, that most of the migrants in what has come to be called the Great Migration came from rural areas and were motivated by two concurrent factors: the collapse of cotton industry following boll weevil infestation, which began in 1898, and increased demand in the North for labor following the cessation of European immigration caused by the outbreak of the First World War in 1914. This assumption has led to the conclusion that the migrants’ subsequent lack of economic mobility in the North is tied to rural background, a background that implies unfamiliarity with urban living and a lack of industrial skills.

But the question of who actually left the South has never been investigated in detail. Although numerous investigations document a flight from rural southern areas to southern cities prior to the Great Migration, no one has considered whether the same migrants then moved on to northern cities. In 1910 over 600,000 Black workers, or ten percent of the Black work force reported themselves to be engaged in "manufacturing and mechanical pursuits", the federal census category roughly including the entire industrial sector. The Great Migration could easily have been made up entirely of this group and their families. It is perhaps surprising to argue that an employed population could be tempted to move, but an explanation lies in the labor conditions then prevalent in the South.

About thirty-five percent of the urban Black population in the South was engaged in skilled trades. Some were from the old artisan class of slavery--blacksmiths, masons, carpenters--which had a monopoly of certain trades, but they were gradually being pushed out by competition, mechanization, and obsolescence. The remaining sixty-five percent, more recently urbanized, worked in newly developed industries--tobacco, lumber, coal and iron manufacture, and railroads. Wages in the South, however, were low, and Black workers were aware, through labor recruiters and the Black press, that they could earn more even as unskilled workers in the North than they could as artisans in the South. After the boll weevil infestation, urban Black workers faced competition from the continuing influx of both Black and White rural workers, who Were driven to undercut the wages formerly paid for industrial jobs. Thus, a move north would be seen as advantageous to a group that was already urbanized and steadily employed, and the easy conclusion tying their subsequent economic problems in the North to their rural backgrounds comes into question.

Notes: boll weevil infestation 棉铃虫蔓延。cessation 中止，停止。mason 泥瓦匠。recruiter 招募者。influx流入，涌入。

According to the text, which of the following is true of wages in southern cities in 1910（）

A. They were being pushed lower as a result of increased competition

B. They began to rise so that southern industry could attract rural workers

C. They had increased for skilled workers but decreased for unskilled workers

D. They had increased in large southern cities but decreased in small southern ones