According to Paragraph 2, which of the following statements is true?
A．Different rates of common cancers in different regions result from different lifestyles.
B．The rate of several extremely common cancers in the U. S. is higher by 1/10 or 1/20.
C．People who migrate to the United States have high cancer rates after a generation.
D．If people out of the western world stay at home, their risk of cancer won't rise.

未分类题What can we learn from the passage?A．The present situation of women's social status is satisfying.B．NAS will address gender-related problems one by one.C．The report posted by IAC doesn't give a clear evaluation of gender problems.D．The only aim of the report was to remove barriers and increase chances for women.

未分类题In the United States, both genomicists and plant scientists want to find outA．the way converting sugars from crops such as corn or sugarcane to ethanol.B．how to process cellulose from the cell walls of stems and leaves.C．how to increase the oil content of oil-producing crops.D．how to make high-energy plants.

未分类题Why switch grass and Miscanthus were taken as energy plant?A．Because they contain more cellulose.B．Because genomes have been sequenced for clues to make other plants better energy crops.C．Because some scientists are breeding a wide variety of candidate crops.D．Because the spotlight is on this underdeveloped field.

未分类题Which of the following best summarizes the main idea of the passage?A．Plant Breeders' dream will come true.B．Converting sugars from crops is a threaten to the food supply.C．The research on the high energy plant is being done.D．Cost-effective biofuels are very popular now.

未分类题Why the individuals, companies as well as governments are desperate for farmland?A．Because people get food mainly from farmland.B．Because 50 million acres farmland vanish each year.C．Because farmland is the potential investment.D．Because people see the farmland as the root of all commodities.

未分类题The word 'backfire'(Line 3, Para. 8)most probably meansA．to come to their senses.B．to produce helpful results.C．to make little progress.D．to get an outcome against the purpose.

未分类题We may infer from the last paragraph thatA．treating burn victims is not a problem now.B．real skin replacement means skin grafts with rejection.C．people at the Army medical center has grown each soldier's graft.D．one way to treat burn victims is to grow a patient's own skin as a graft.

未分类题What was the result of doubling the funding from $42.5 million to $85 million over 5 years?A．There would be much more wounded people who can be cured.B．Another consortium could come in to compete with the planned one.C．Researchers in the consortia's 28 research groups could get more public and private funds to match DOD's input.D．Robert Vandre would change the consortium to a larger one.

单项选择题氨苄青霉素可采用的含量测定方法是:()

单项选择题人体肝细胞属于()

单项选择题联觉是指()

单项选择题深昏迷最突出特点是：()

未分类题Chietigj Bajpaee is cited to illustrate that developing countriesA．are working hard to buy farmland.B．are considered not able to stop the conversion of land.C．are exception in solving the food problem.D．are imposing rules to preserve farmland.

未分类题The authors attitude towards promotion of homeownership is

未分类题We may infer from the second paragraph thatA．Will Wright is the producer of the film.B．the description of the film on the Website is an advertisement of Spore.C．Will Wright visited the scientists to learn something about biology.D．the documentary is a film of 150 minutes.