It may be inferred from the passage that________.

A．pirates frequently attacked ships sailing along the Caribbean. B．besides trading vessels, others ships were also equipped with guns. C．it was mores dangerous to trade in the Mediterranean. D．the flyboat was often used in the Caribbean. 此题为多项选择题。

A．raising the world’s temperature only a few degrees would not do much harm to life on the earth B．lowering the world’s temperature merely a few degrees would lead many major farming areas to disaster C．almost no temperature variations have occurred over the past decade D．the world's temperature will remain constant in the years to come

A．the human eye is sensitive to all wavelengths B．colors are related to wavelengths C．there are more color-blind women than color-blind men D．failure of rods cause color-blindness

A．the force of the electromagnetic field is too weak to be harmful B．the force of the electromagnetic field is weaker than the electric field that the cells generate C．electromagnetic field may affect health D．only more powerful radiation can knock electron out of human body

A．is in favor of prohibiting passengers' use of electronic devices completely B．has overestimated the danger of electromagnetic interference C．hasn't formed his own opinion on this problem D．regards it as unreasonable to exercise a total ban during flight 此题为多项选择题。

A．little opportunity to develop according to their own inclinations than ordinary children B．more opportunity to develop according to their own inclinations than ordinary children C．as much opportunity to develop according to their own inclinations as ordinary children D．absolute opportunity to develop according to their own inclinations 此题为多项选择题。

A．the sightseers cannot visit the Castle and the Palace separately B．the playgoers spend more money than the sightseers C．the sightseers do more shopping than the playgoers D．the playgoers go to no other places in town than the theater 此题为多项选择题。

A．the Obama administration takes on some members of the Bush crew. B．some members of the Bush crew are involved in negative publicity. C．Obama"s approach to national security is proved by Cheney to be a failure. D．George Bush is not popular with Americans as a president at all.

A．the private sector is the last straw for health services. B．the physical condition of workforce is rather weak. C．some miners might have been infected with AIDS. D．HSBC attracts customers with innovative health schemes.

A．killing foxes with poison is illegal B．limiting the fox population is unnecessary C．hunting foxes with dogs is considered cruel and violent by some people D．fox-hunting often leads to confrontation between the poor and the rich

A.the UK is reluctant to remold its economic pattern . B.GDP as the measure of success is widely defied in the UK . C.the UK will contribute less to the world economy . D.policymakers in the UK are paying less attention to GDP .

A．half of college students hold credit cards B．students will no longer get credit cards C．over 4/5 college students have debt difficulties D．tuition is too high for most of the college students

A．Mr. Cattanzara was surprised at George's reading plan. B．Mr. Cattanzara was doubtful about George throughout. C．George was forced to tell a lie and then regretted. D．George lied at the beginning and then became serious.

A．was produced because of the seawater infused into the reactors in Fukushima. B．was similar to that grew from the underwater nuclear test in the 1950s and 60s. C．will mushroom as that derived from the underwater nuclear test half a century ago. D．will spread widely and mix with air in different layers of atmosphere.

A．schools in poor areas have difficulty in attracting good teachers. B．only around 1,500 top-third students choose to be teachers. C．improving the students" performance may have positive effect on economy. D．teachers in the US have lower prestige than those in other top-performing nations.

A．is part of Microsoft"s Windows operating system. B．can help a computer to avoid online criminals. C．is offered by legitimate Web sites. D．can control a computer through its system weakness.

A．human activities will do grave damage to rainforests B．Amazon rainforest soils used to be the richest in the world C．farming is responsible for the destruction of the Amazon rainforests D．there once existed an urban civilization in the Amazon rainforests

A．culture exercises an influence over social interrelationship. B．courteous convention and individual interest are interrelated. C．various virtues manifest themselves exclusively among friends. D．social interrelationships equal the complex set of cultural conventions.

A．the students' behavior. in the classroom is very bad B．the teachers do not have a strong sense of responsibility C．the educational department should be to blame D．the teachers should be able to adjust their teaching methods to the development of society

A．the trends which can be tracks B．the deployment of the blue line C．the overwhelming presence of criminals in London D．the number of the days of terrorist attacks

A．specific DNA or RNA sequences are developed to detect the viruses. B．it is not a quick way to look for DNA sequences. C．systems to detect viruses are working to enter the market. D．treatments for some specific virus are successful.

A．the coast was straight and unobstructed B．ships there had high masts C．coastal waters were safe D．the lighthouses were built on high places

A．Glenn Mulcaire may deny phone hacking as a crime. B．more journalists may be found guilty of phone hacking. C．Andy Coulson should be held innocent of the charge. D．phone hacking will be accepted on certain occasions.