【正文】 following statements about radar39。s function for marine purposes is incorrect? ________. A. It provides the navigator the ship39。s position B. It provides information to protect ships from collision C. It displays all the objects at sea clearly D. It displays the observer39。s distance from ships and obstructions nearby the ship39。s radar is in trouble， the shorebased radar ________. A. may provide the ship of her position B. should be installed with surveillance systems C. shall advise the ship to use VHF D. will be put into use immediately surveillance systems ________. A. may provide all ships of their technical conditions B. should be installed with VHF C. shall be correctly interpreted， D. are intended to smooth and control the flow of traffic to and from the harbor. Passage 15 Communications over relatively short distances can be made by visual or sound signals. Visual signals can be sent by using flags or an Aldis lamp. An Aldis lamp is an electric lamp used for flashing messages in Morse code. The traditional method of signaling from one ship to another is by using flags. There are different colored flags for each letter of the alphabet. There are also pennantshaped flags for numbers， and a long pennant， known as an answering or code pennant. Three other flags， which are burgeeshaped， are known as substitutes. These show that the flat or pennant is being repeated. Besides standing for a letter of the alphabet， each flag， when hoisted along， has another meaning. For example， the W flag also means: I require medical assistance. Flags can also be hoisted in binations of two， three or four. Siren， whistle， bell or other sound signals can be used in fog and similar circumstances when visual signals can not be seen. over relatively short distances may be made by ________. A. visual signals B. sound signals C. Morse Code 8 D. Either visual or sound signals Aldis lamp is used for ________. A. transmitting Morse code B. flashing flags C. sending flag signals D. sending sound signals flags are used as substitutes to show ________. A. repeating B. answering C. code pennant D. I requiring medical assistance are used in fog and similar circumstances when visual signals can not be seen. A. Visual signals B. Substitutes C. Pennantshaped flags D. The ship39。s siren， whistle or bell Passage 16 When the senders of goods have large shipment to make， and especially when bulk cargo is concerned， it is advisable that they have some ships at their disposal. Some of the big panies set up a fleet of their own， but the rest may find it more profitable to hire instead of building or buying ships. This is called chartering. The chartering of the ship is usually done through the intermediary of brokers， who， when hired， will go through all the necessary formalities on behalf of the charterer. In London there is a special center the Baltic Exchange， where the brokers operate in much the same way as stock and share brokers on a stock exchange. But it is easy for home shippers to hire Chinese or foreign ships through China National Chartering Corporation， which takes care of chartering business on orders from various import and export corporations. large shipment is concerned， ________ is not the way for the sender to have ships at their disposal. A. to charter ships B. to build ships C. to buy ships D. to scrape ships chartering all the necessary formalities are performed through ________. A. the intermediary of agents B. the intermediary of brokers C. the charterers D. the Baltic Exchange function of the Baltic Exchange is ________. A. to deal with stocks B. to exchange cargoes C. to operate on shares D. to charter ships National Chartering Corporation takes care of chartering business for home shippers. To take care of means ________. A. to pay attention to B. to be concerned with C. to be liable for D. to take charge of Passage 17 A tropical storm is not so extensive as the depression of higher latitudes but， within 75 miles or so of the center， the wind is often far more violent， and the high and confused seas near the center may cause considerable damage to large and wellfound ships， while small vessels (for example， destroyers) have foundered. The danger is still greater when ships are caught in restricted waters without adequate room to maneuver. Within 5 to 10 miles of the center the wind is light or moderate and variable， the sky is clear or partially so， and there is a heavy， sometimes mountainous，confused swell. This area is known as the eye of the storm. After passing through the relatively windless center of the storm the wind will suddenly， and with great violence， mence to blow from a direction opposite to that experienced on the other side of the windless center. Due to torrential rain visibility near the storm center is almost nil. ________ of a tropical storm center， the wind is violent. A. no more than 75 miles B. not more than 75 miles C. 75 miles or a greater distance D. about 75 miles the following， ________ one may not be found in the eye of the storm? A. The visibility is moderate or good B. The wind is light or moderate C. The sky is clear or partly cloudy D. The swell is low or moderate. the passage， a wellfound ship means ________. 9 A. a ship has been found in any place B. a ship has been found in good visibility C. a ship with all the necessary equipment properly maintained D. a ship in huge size visibility near tropical storm center is ________. A. Very