问题 单项选择题

To persuade consumers to buy more of its cameras, the PictureSharp Camera company has launched an advertising campaign in coordination with its dealers to promote the slogan, ’A Picture Is Worth a Million Words." The dealers participating in the program are experiencing very robust sales, but PictureSharp analysts are concerned that the campaign is not successfully meeting its goals. Which of the following, if true, most justifies the concerns of the PictureSharp analysts that the campaign is not successful ?()

A. The new PictureSharp slogan is a thinly veiled imitation of the better-known saying, "a picture is worth a thousand words."

B. PictureSharp is one of the leading manufacturers of digital cameras, which although generally more expensive than conventional film cameras, are considerably more versatile.

C. Many consumers who saw the commercials in this advertising campaign were concerned that they lacked the artistic skill to create a picture that would actually be worth "a million words."

D. Although almost all PictureSharp camera dealers participated in the advertising campaign by displaying promotional materials in their stores, some of them did not display or distribute all of the marketing materials that PictureSharp sent them.

E. All PictureSharp dealers also sell other brands of cameras, some of which are comparable to PictureSharp cameras in features and quality but significantly lower in price, allowing the dealers to charge a higher markup than for PictureSharp cameras.

答案

参考答案:E

解析:

The passage says that participating dealers are experiencing robust sales, but it does not say that they are selling more PictureSharp cameras. If the dealers have an economic incentive (higher markups) to direct their customers to other comparable brands of camera, the PictureSharp campaign may be driving customers into the stores only to benefit other camera companies. Answers A and B are mostly irrelevant to the question; C does not address the apparent anomaly between the dealers’ robust sales and the analysts’ concerns; and D is a far weaker justification for the analysts’ doubts than the economic concern stated in E.

单项选择题

在生物和食品技术的应用领域,会经常使用肌动蛋白结合体,它产生于黑曲霉。在植物中,肌动蛋白结合体约束着肌动蛋白的活动,而后者是植物细胞内部结构的主要组成部分,肌动蛋白结合体还干扰着植物的花粉管,阻止细胞成长。肌动蛋白结合体也能约束人体和动物移动细胞(如肿瘤中负责新血管形成的细胞等)中的肌动蛋白。
通过阻止肿瘤的血液供应,肌动蛋白结合体可以终结恶性肿瘤细胞通过血液进行转移的能力。研究还发现,肌动蛋白结合体对正常细胞没有毒害,因此,极大地排除了出现副作用的风险。
通过对提取获得的人类结肠痛、乳腺痛和黑素瘤等细胞进行试验发现,如果增加肌动蛋白结合体的水平,就能够降低这些癌细胞形成肿瘤组织的能力。通过进一步的动物试验发现,肌动蛋白结合体的增加,能够制约因结肠癌细胞产生的肿瘤生长,转移和血管的形成。
在完成人类基因组计划时,科学家在6号染色体上发现了像肌动蛋白结合体一样,位于被编码为RNaseT2的基因上的人类蛋白质。希伯莱大学的研究人员利用基因工程方法制造的RNaseT2蛋白质,具有非常明显的抗癌作用。研究人员说,对真菌肌动蛋白结合体和人类RNaseT2的研究,为一线抗癌新药的研制打下了基础。这一成果已经引起国际学术界和商业界的极大关注。

下列判断正确的是( )。

A.生物和食品技术领域必定使用蛋白结合体

B.RNaseT2蛋白质是研究人员利用基因工程方法制造的

C.肌动蛋白结合体对正常细胞不会产生作用

D.RNaseT2目前是国际学术界关注焦点

单项选择题