Is this passage written in block comparison or contrast or in alternating comparison or contrast?

A．most marketable pearls are cultured because nature does not produce enough of its own to satisfy the market B．cultured pearls are of a higher quality than natural pearls C．there are two major methods of pearl-making D．a natural "drought" of pearl production is taking place

A．admired for his trickery B．no match for the lion C．pitied for his trick D．considered worthless

A．Some runners looked like Elvis Presley. B．Some runners were ready to put out a fire. C．Some runners were participating in a wedding. D．Some runners were serious about winning.

A．To tell the reader that the use of cell phones is as bad as smoking. B．To call for a ban on the use of cell phones in the public. C．To emphasize the immoral effect of the cell phone on our consciousness. D．To draw public attention to the problems caused by the use of cell phones. 此题为多项选择题。

A) to stress the impact of the computer on society B) to explain the concept of the computer literacy C) to illustrate the requirements for being competent citizens of tomorrow D) to emphasize that computer programming is an interesting and challenging job

A．Approving. B．Criticizing. C．Ironical. D．Neutral.

A．The writing of a composition. B．The finding of materials. C．The writing of a research paper. D．The writing of an essay.

A．The trainer team buys dogs in large cities B．The trainer team accepts dogs given by some citizens C．The trainer team raises dogs all by themselves instead of buying them D．The trainer team buys dogs suitable for training

A．sympathetic B．doubtful C．critical D．objective

A．describe different types of medicine B．argue for the importance of medicine in health care C．show the crucial role religion plays in medical treatment D．compare the educational background of three different types of patients

A．to stress the impact of the computer on society B．to explain the concept of computer literacy C．to illustrate the requirements for being competent citizens of tomorrow D．to emphasize that computer programming is an interesting and challenging job 此题为多项选择题。

A．Big cities are better than small cities. B．Big cities are exciting places to live in. C．Big cities have a lot of serious problems.

A．point out the role the workaholic plays in the American economy. B．defend people who are addicted to work. C．encourage us not to worry about our imperfection. D．consider the difficulties that confront us at middle-age.

A．the interpretation of the term "environment" B．the discussion on organisms and biological environment C．the comparison between internal and external factors influencing man D．the evaluation of man's influence on culture

A．Both journal articles and conference papers are reported in a brief and informative way. B．All the theses or dissertations and conference papers are reported in spoken languages. C．Both the journal articles and conference papers are influenced greatly by the intended receivers. D．The various formats of research reports may be presented in different ways. 此题为多项选择题。

A．mothers have the practice to go to work B．working mothers have no time to stay with their children at home C．young wage-earners are economically independent D．mother's position in a family has been raised

A．To advise America to learn from its mistakes. B．To tell the readers how to look at WikiLeaks. C．To discuss how to deal with WikiLeaks. D．To show readers how to stick to their rules.

A．people in the business of fast-food. B．people against fast-food. C．the heavy users of fast-food. D．fast-food consumers.

A．To remind people of the need of sustainable development. B．To suggest ways of ensuring sustainable food production. C．To advance new criteria for measuring farming progress. D．To urge people to rethink what sustainable agriculture is.

A．Depressed. B．Optimistic. C．Opposing. D．Negative.

A．tell readers a joke B．complain about his tools C．teach readers some tricks D．criticize himself humorously

A．Revealing the procedures for foreign adoptions B．Recounting an amazing childhood camping experience C．Investigating how Hidden Valley saves foreign adoption families D．Demonstrating how culture camps help foreign adoption families