问题 选择题

用你所学的“生物和细胞”的有关知识来判断,下列说法正确的是(  )

A.细胞中的物质都是自己制造的

B.病毒没有细胞结构,只有寄生在活细胞里才能进行生命活动

C.某同学在透明纸上写一个“b”,那么,在显微镜下的视野中看到的应是“p”

D.人只要靠运动系统就能完成各种体育运动

答案

A、细胞中的这些物质有的是自己制造的,如植物细胞通过光合作用产生有机物,还有的是细胞代谢产生的一些废物,如尿素、二氧化碳等.另外一些物质须从外界获得,如无机盐、水等是通过植物的根从土壤中吸收来的.不符号题意.

B、病毒是一类没有细胞结构的特殊生物,它们的结构基本相似,一般由蛋白质外壳和内部遗传物质组成.病毒必须寄生在其它生物体的活细胞内,靠从这些生物体上摄取养料来维持生活,一旦离开了活的细胞,病毒就无法进行生命活动.符号题意.

C、显微镜看到的物像不但上下颠倒,左右也颠倒.做此类题有个小诀窍,就是把这个在显微镜下看到的字母写到一张小纸上,然后把这张纸旋转180°再看就是左右上下颠倒的图象了.所以某同学在透明纸上写一个“b”,在显微镜下的视野中看到的应是“q”,不符号题意.

D、运动系统只是完成各种体育运动的结构基础,要完成各种体育运动并不是仅靠运动系统来完成的.它需要神经系统的控制和调节.它需要能量的供应,因此还要消化系统、呼吸系统、循环系统等系统的配合.不符号题意.

故选:B

单项选择题
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) .

12()

A.welfare

B.commission

C.pension

D.allowance