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经过仔细研究，他们发现这个设计落后了。

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Today, most countries in the world have canals. Many countries have built canals near the coast, and parallel (67) the coast. Even in the twentieth century, goods can be moved more cheaply by boat than by any other (68) of transport. These (69) make it possible for boats to travel (70) ports along the coast without being (71) to the dangers of the open. Some canals, such as the Suez and the Panama, save ships weeks of time by making their (72) a thousand miles shorter. Other canals permit boats to reach cities that are not (73) on the coast; still other canals (74) lands where there is too much water, help to (75) fields where there is not enough water, and (76) water power for factories and mills. The size of a canal. (77) on the kind of boats going through it. The canal must be wide enough to permit two of the largest boats using it to (78) each other easily. It must be deep enough to leave about two feet of water (79) the keel of the largest boat using the canal. When the planet Mars was first (80) through a telescope, people saw that the round disk of the planet was crises-crossed by a (81) of strange bluegreen lines. These were called "canals" (82) they looked the same as canals on earth (83) are viewed from an airplane. However, scientists are now (84) that the Martian phenomena are really not canals. The photographs (85) from space-ships have helped us to (86) the truth about the Martian "canals".

A. [A] cross [C] move
B. [B] pass [D] advance

It seems you always forge--your reading glasses when you are rushing to work, your coat when you are going to the cleaners, your credit card when you are shopping... Such absent-mindedness may be (47) to you, now British and German scientists are developing memory glasses that record everything the (48) sees. The glasses can play back memories later to help the wearer remember things they have forgotten such as where they left their keys. And the glasses also (49) the user to "label" items so that information can be used later on. The wearer could walk around an office or a factory identifying certain (50) by pointing at them. Objects indicated are then given a (51) label on a screen inside the glasses that the user then fills in. It could be used in (52) plants by mechanics looking to identify machine parts or by electricians wiring a (53) device. A spokesman for the project said: "A car mechanic for (54) could find at a glance where a part on a certain car model is so that it can be identified and repaired. For the motorist the system could (55) accident black spots or dangers on the road." In other cases the glasses could be worn by people going on a guided tour, (56) points of interest or by people looking at panoramas where all the sites could be identified.[A] allow[I] user[B] instance[J] complicated[C] blank [K] white[D] industrial [L] annoying[E] frustrating [M] successful[F] items [N] articles[G] indicating [O] simple[H] highlight

He continued to search through the Bahamian Cays down to Cuba, a place name which suggested Cipangu (Japan), and then eastward to the island he named Espanola.

Out of all the glorious tales written about the U. S. revolution for independence from Britain, the fact is hardly known that a black man was the first to die for American independence.