For the safety-conscious Swedish market, a United States manufacturer of desktop computers developed a special display screen that produces a much weaker electromagnetic field surrounding the user than do ordinary screens. Despite an advantage in this respect over its competitors, the manufacturer is introducing the screen into the United States market without advertising it as a safety improvement.
Which of the following, if true, provides a rationale for the manufacturer’s approach to advertising the screen in the United States ？（）

A．Many more desktop computers are sold each year in the United States market than are sold in the Swedish market.

B．The manufacturer does not want its competitors to become aware of the means by which the company has achieved this advance in technology.

C．Most business and scientific purchasers of desktop computers expect to replace such equipment eventually as better technology becomes available on the market.

D．An emphasis on the comparative safety of the new screen would call into question the safety of the many screens the manufacturer has already sold in the United States.

E．Concern has been expressed in the United States over the health effects of the large electromagnetic fields surrounding electric power lines.

在句中横线上依次填入词语，恰当的一项是______。
①长时间在噪音环境中工作的人，应多吃蔬菜、水果，及时______噪音造成的维生素过度消耗。
②唐币“开元通宝”上有一条指甲痕，经钱币专家研究，______是一个女人的指痕。
③扬州雕版印刷的代表作之一是曹寅主持刊刻的卷帙______的《全唐诗》。

A．补救 确立 浩蔼
B．补偿 确认 浩繁
C．补助 确凿 浩大
D．补给 确保 频繁