According to Paragraph 4, we can see that the author believes thatthe newly developed technologies are aimed at curing fatal diseases。 ().

A.The US is much more advanced in its health care system

B.American people are better at research than other people

C.new medicines are being developed all over the world

D.the newly developed technologies are aimed at curing fatal diseases

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 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.

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

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

A.accordance with

B.according to

C.according with