问题 单项选择题

下列有关“人工种子”的叙述,错误的是()

A.人工种子的培育是一种无性繁殖

B.胚状体承担的功能是分裂分化成根、茎、叶

C.人工种子的种皮是自我生成的

D.人工种子与自然种子相比,具有的特殊优点是保持亲本的优良性状

答案

参考答案:C

解析:人工种子是将愈伤组织形成的胚状体、不定芽、顶芽和腋芽经过人工包装形成的,故A正确。胚状体是要分化成根、茎和叶,故B正确。人工种子的种皮是人工包装的,故C错误。人工种子与自然种子相比,具有的特殊优点是保持亲本的优良性状,不会发生性状分离,故D正确。

选择题
单项选择题

A variety of illegal acts committed by people in the course of their employment, for their own personal gain, are collectively known as white-collar crime. Embezzlement, theft and trading securities (1) insider information are common forms of white-collar crime. The majority of cases involve low-level employees who steal because they are under (2) financial stress. Many plan to (3) the money back as soon as possible but may never do so. Their crimes are usually never (4) because the amounts of money are small, and no one notices the (5) .

(6) , there are some very large cases of white-collar crime, such as multimillion-dollar stock market or banking seams that take years to discover and are extremely difficult and expensive to (7) .

White-collar crime is not (8) to the business sector. Government employment, especially (9) the city level, also provides opportunities to (10) one’s pockets. (11) , building inspectors accept bribes and full-time employees receive (12) payments.

Although white-collar crime is less (13) than street crime, it involves (14) more money and harm to the public than crimes committed by street criminals. It is (15) that there are more criminals (16) the office suites than in the streets, yet the (17) of white-collar makes it difficult to uncover the offenses and pursue the offenders. As the economy (18) from manufacturing to services and electronic commerce, opportunities for white-collar crime (19) , while the technology needed to stop such crimes will (20) .

8()

A.restrained

B.constrained

C.confined

D.bound