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(a) C4H10O属于()类有机化合物。
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(b)CH3OC2H5属于()类有机化合物。
(c)乙二醇属于()类有机化合物。
Cloze: Text-relatedComplete the passage with words chosen from the Words and Phrases to Drill box. Change the form where necessary.abolish alongside bid authorize capture compel confident conviction decade disguiseforge historic impose missionmotivate racial religious settlement shelter siteslender spot terminalthreatweb as forat riskbe intent onclose in (on / around) in the eyes of make the best of on the side pass for stand up (for)The Underground Railroad was ______________ (1) by the efforts of those who were prepared to fight against slavery and ________ _____ _________ (2) for the long-suffering Southern black Americans. Some of those who helped to transport slaves to the north and freedom were former slaves themselves. Others felt ________________ (3) to take part because of their deeply held _________________ (4). For many of those involved, liberating the slaves from those who exploited them became a __________ (5). While their eventual goal was to ___________ (6) slavery completely, in the meantime they were ________ _____ (7) helping to free as many slaves as possible, often at considerable _________ (8). ______ ________ _________ ______ (9) slave owners, they were dangerous enemies and frequently received death ____________ (10).
Cloze: Theme-relatedRead the passage carefully until you have got its main idea, and then select one appropriate word for each gap from the box following the passage.Despite the name, the Underground Railroad was not really a railroad, but was a network of people who assisted fugitive slaves. Many fugitives who escaped to the North and Canada received _____________ (1) along the way from individuals who were _______________ (2) in this network. By the early 19th century, the organization became so successful that it is __________________ (3) that between 1810 and 1850, 100,000 slaves escaped from the South through the Underground Railroad.It was not a(n) __________________ (4) that it was called the Underground Railroad. Steam railroads had just _______________ (5) and the terms used to describe the people who helped and the fugitives were related to the railroad line. Fugitive slaves were called "parcels" and "passengers", the helpers were the "conductors", the people who provided their homes as refuge were called "stationmasters," and the homes were _______________ (6) to as "depots" or "stations".The route used was an important part of a successful escape. There were _______________ (7) secret routes that a conductor could use. The one used depended on where the search parties and slave catchers were ______________ (8). Some trips required the use of many different routes. If it appeared that they might be in danger, a guide would change paths. Some guides and fugitives even hid out in bushes and swamps for many days until it was safe to continue on. Quickness was not the main _____________ (9), instead safety was most important and as a result they often zigzagged in order to avoid ____________ (10).numerouscapture accumulated assistance inspired estimated coincidence curiosityemerged concern referred stationed previous involved incident
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