In the first paragraph of this article, the authors mainly discuss the importance of findi

In which paragraph does the author state his purpose of writing？

A. The third paragraph

B. The first paragraph

C. The last paragraph

D. The last but one paragraph

What does the author intend to demonstrate with "office hours" adopted by the old (Paragraph 2) ？

A．A type of enforced systems.

B．A symbol for human initiatives.

C．A sort of freedom deprivation.

D．A token for the old' obsoleteness.

The sentence "They are free to listen to and live by their circadian rhythms." (In Paragraph 4) probably means ______.

A．They can lead their daily lives according to their biological clocks, without referring to a man-made clock.

B．They can listen to the wonderful rhythms of the biological clock and live close to them.

C．They can live by regulating their own circadian rhythms.

D．They are free from the annoying rhythms of everyday life.

What does the sentence "Programming other board games has been a relative snap. " (Paragraph 2) indicate？

A．Programming other board games has been relatively easy.

B．Programming other board games has been relatively difficult.

C．Programming other board games has been relatively complicated.

D．Programming other board games has been relatively predictabl

A、A. the first day of the first lunar month

B、B. the first day of the first new month

C、C. the first day of the first month

D、D. the first day

【C4】______

A．At first

B．In the beginning

C．At first hand

D．In the first place

【B2】

A．At first sight

B．At the beginning

C．In the first view

D．From the first

()是一种先进先出(First In First Out，FIFO)的线性表。