47 Which of the following are NOT man-made pollutants in the ocean？
(A)Pesticides
(B)Marine  algae
(C)Herbicides 
(D)Detergents 

43 You must drop back from vessel ahead of you. (A)You must drop dangerous cargo from the vessel. (B)You must drop anchor away from the vessel ahead of you. (C)You should shorten the distance from vessel ahead of you. (D)You should increase the distance from vessel ahead of you.

44 Inform coast radio station about name of vessel with survivors. (A)Report the call sign of the vessel in distress. (B)Report the call sign of the vessel not under command. (C)Report the name of the vessel that has survivors on board. (D)Report the call sign of the vessel that took part in the rescue.

45 When the ship causes oil pollution to the port, she will be _____. (A)fined (B)paid  (C)deducted (D)levied

46 Under Washington’s so-called “wet foot, dry foot policy,” Cuban migrants who make it onto U.S. soil are allowed to remain in the United States under a special immigration exception, while those _____ at sea are turned back. (A)interdict (B)intercept  (C)intercepted  (D)interested 

48 Which of the following words does NOT refer to a crime？ (A)Kidnapping (B)Counterfeiting  (C)Arson  (D)Snorkeling 

49 A woman acquires a phony passport. After she enters the country illegally, she is _____ by the Freedonia police and put into jail. (A)apprehended (B)comprehended  (C)complicated  (D)appreciated 

50 The border between the two countries is a 3 km wide river which is _____ with hungry sharks. (A)infested (B)ingesting  (C)digested  (D)infringed 

51 Which of the following is NOT a drug name？ (A)Heroin (B)Marijuana  (C)Cholesterol  (D)Cocaine 

52 In certain regions, ocean currents _____ trillions of decomposing plastic items and other trash into gigantic, swirling garbage patches. (A)oral (B)oval  (C)coral  (D)corral 

53 Several merchant ships are arriving at the scene of a distress incident. One of them must assume the duties of the Coordinator Surface Search（CSS）. Which of the following statements is TRUE？ (A)A tank vessel should never be assigned CSS duties unless only tank vessels are present. (B)CSS duties are always assumed by passenger vessels, dry cargo vessels, or tankers in that order of precedence. (C)The CSS must be established by a mutual agreement between the ships concerned. (D)The first vessel to arrive at the distress incident is designated as the CSS.