Pure naphtha is highly explosive if （ ）to an open flame.
A.it exposed B.exposed C.it were exposed D.expose it
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Pure naphtha is highly explosive if （ ）to an open flame.
That trumpet player was certainly loud. But I wasn’t bothered by his loudness （ ）by his lack of talent.
Space shuttle Endeavor pulled up to the international space station and docked Wednesday, kicking off almost two weeks of demanding construction work.Before the late-night linkup. Endeavor’s commander, Dominic Gorie, （1）the shuttle through a 360-degree backflip to allow for full photographic surveillance.It’s one of the many safety-related （2） put in place following the Columbia tragedy in 2003.The space （3 ） crew used cameras with high-powered zoom leases to photograph Endeavor （4） nose to tail, especially all the thermal tiles on （5）belly. The pictures—as many as 300一will be scrutinized by （6） on the ground to see whether the shuttle suffered any damage （7） Tuesday’s launch.Something, maybe a bird, may have struck Endeavor’s nose （8） or ten seconds after liftoff. The launch images are inconclusive so （9） • NASA expects that images collected during the astronauts’ laser inspection of the nose and wings will reveal any damage, if it’s there.LeRoy Cain, chairman of the mission （10） team, said the launch video suggests to some that Endeavor’s nose took a hit. Still photos, on the other hand, show no impact.“It’s too early to speculate.” Cain said late Wednesday afternoon. “The （11） has got a lot of work to do on that as well as other debris items.”Also, right at liftoff, something （12） to fall off the tail end of the shuttle, possibly part of a thermal tile. Later, at the 83-second mark, a piece of debris, （13） fuel-tank foam insulation, appeared to miss the shuttle’s right wing.“There’s nothing that stands out in terms of things that we’re worried about.” Cain said. The photographs preceding the docking will （14） to NASA’s arsenal of data for determining whether Endeavor will be able to re-enter safely at the end of its 16-day （15）, the longest space station mission ever by a shuttle. All the analysis will take several days.Bell chimes heralded Endeavor’s arrival just （16） midnight. “Endeavor arriving,” space station commander Peggy Whitson called out as she rang the vessel’s bell.“Peggy, that’s the sweetest bell I’ve ever heard. Thank you very much.” Gorie replied. Mission Control praised Gorie for his expert （17） . Besides seven astronauts, one of （18）Japanese, Endeavor holds the first piece of Japan’s new space station lab, Kibo, which is Japanese （19） “hope.” The storage compartment will be attached to the orbiting complex on Friday; it’s temporary location until the lab arrives in May.Endeavor also is （20）a two-armed Canadian robot, named Dextre that will be assembled during the first three spacewalks of the mission, as well as a new space station resident. Garrett Reisman.In all, five spacewalks are planned. a new space station resident.
One of the chief functions of education is to equip fbture citizens with all they require to take their place in adult society. Now adult society is made up of men and women, so how can a segregated school possibly offer the right sort of preparation for it? Anyone entering adult society after years of segregation can only be in fora shock.A co-educational school offers children nothing less than a true version of society in miniature.Boys and girls are given the opportunity to get to know each other, to learn to live together from their earliest years. They are put in a position where they can compare themselves with each other in terms of academic ability, athletic achievement and many of the extra-curricular activities which are part of school life. What a practical advantage it is to be able to put on a school play in which the male parts will be taken by boys and the female parts by girls!But perhaps the greatest contribution of co-education is the healthy attitude to life it encourages. Boys don’t grow up believing that women are mysterious creatures-airy goddesses, more like book-illustrations to a fairy-tale, than human beings. Girls don’t grow up imagining that men are romantic heroes. Years of living together at school dismiss such illusions. The awkward stage of adolescence brings into sharp focus some of the’ physical and emotional problems involved in growing up. These can better be overcome in a co-educational environment. When the time comes for the pupils to leave school, they are fully prepared to enter society as well-adjusted adults. They have already had years of experience in coping with many of the problems that face men and women.1.What does co-education offer to children?2.What does the word “segregated” (Para. 1) probably mean?3.According to the passage, what is one of the chief aims of education?4.Why don’t boys and girls in co-education have illusions about each other?
（ ） to space travelers is high acceleration or deceleration forces.
The tenacious families feuded for generations, and inimical feelings are still fixed in their（ ）.