Compared with Cutthroat trout, rainbow trout
A．can better adapt to warm temperatures.
B．has to retreat further to a restricted habitat.
C．has shown stronger survival ability.
D．lays more eggs when winter floods come.

未分类题The prediction on the habitat of trout is based onA．a scientific simulation including various factors.B．the field work of a team of scientists.C．the characteristics of the west part of America.D．the presence of fish in different habitats of trout.

未分类题The phrase 'dodge a bullet'(Line 3, Para.3)most probably meansA．escaping successfully from a hunter's shooting.B．being lucky and escaping the fate of destruction.C．having the ability to run away from a bullet.D．dying in a large number due to shooting.

未分类题The eggs produced in Wright County Egg and Hillandale Farms haveA．led to the largest recall of 2,000 eggs in the U. S.B．sickened two dozen distributors in 17 states.C．been contaminated due to salmonella outbreak.D．led to the collapse of the food system.

未分类题What does the National Cancer Institute intend to do?A．To deal with the budget problem of its contract lab.B．To attract more outside researchers to its research.C．To find out how to tackle a cancer-related protein.D．To separate the mutated cells from healthy ones.

未分类题What does 'the two other new studies' in Paragraph 4 aim to survey?A．The campaign to have babies sleep on their backs has been very successful.B．The campaign to have babies sleep on their backs isn't getting to everyone.C．How baby-carers are implementing existing guidelines for reducing SIDS deaths.D．How many percent of parents are not following recommendations of back-to-sleep.

未分类题Customers turned to local egg producers rather than supermarkets because they thoughtA．it's safer to eat free-range eggs.B．small-scale producers are more humane.C．salmonella is only limited to large farms.D．free-range eggs have lower salmonella.

判断题Indians move to Britan in 16th century.()

未分类题What is the American Indians fighting against?A．President Obama's proposal.B．The Bush-era taxes cuts.C．The state's cigarette taxes on them.D．The federal government's oppression.

未分类题According to the passage, the administrations of governorsA．devoted a lot to the Senecas' economics.B．closed the interstate highways for cigarette sales.C．failed to get funds from the reservations.D．did a great job in dealing with the Indian nations.

未分类题What measure did Jill take after she became the executive editor?A．She expanded The New York Times' foreign bureaus.B．She encouraged reporters to compete for the Pulitzer Prize.C．She changed The New York Times' online subscription policy.D．She set stricter requirement on errors in the reports.

未分类题The expression 'faint of heart'(Line 1, Para. 4)is closest in meaning toA．female reporters.B．sensitive personality.C．frail character.D．incompetent people.

未分类题According to Matthew Wilson, Frieds study is important becauseA．it's a professional study carried out by UCLA neuroscientist.B．it results from the cooperation of Itzhak Fried and foreign experts.C．it follows the long-held assumption of many experts in this field.D．it proves the long-held assumption of many experts in this field.

未分类题Exploring the storage and retrieval of information in brain is a meaningful matter because itA．helps people to remember what happened in the past more accurately.B．helps doctors to restore memory function to aging or diseased brains.C．proves storage and retrieval of information are concentrated in the same cells.D．provides people the opportunity to see human memory recall in action in real time.

未分类题According to the passage, which of the following statements is true?A．Whether people can recall the details of yesterday's lunch is a trivial matter.B．After years of research, doctors made initial progress in restoring episodic memory.C．What's published in Science this month is carried out by Fried and his colleagues.D．Some experts think the discovery of when neurons work in Fried's study is useless.

单项选择题岩溶水按垂直方向可分为垂直循环带,季节循环带,( ),深部循环带.A.潜水带B.承压水带C.水平循环带D.地表溶蚀带