THE DOCTOR INSISTED THAT HIS PATIENT _____________________A. TAKING I...

68: The doctor insisted that his patient _____________________A. taking it easy inside of three months B. that he not work too hard for three monthsC. take it easy for three months D. to take some vacations for three monthsRead the following passage and mark the letter A, B, C, or D on your answer sheet to indicate thecorrect answer to each of the questions that followLighthouses are towers with strong lights that help mariners plot their position, inform themLinethat land is near, and warn them of dangerous rocks and reefs. They are placed at prominentpoints on the coast and on islands, reefs, and sandbars.Every lighthouse has a distinctive pattern of light known as its characteristic. There are five5basic characteristics: fixed, flashing, occulting, group flashing, and group occulting. A fixedsignal is a steady beam. A flashing signal has periods of darkness longer than periods of light,while an occulting signal’s periods of light are longer. A group-flashing light gives off two oremore flashes at regular intervals, and a group-occulting signal consists of a fix light with two ormore periods of darkness at regular intervals. Some lighthouses use lights of different colors aswell, and today, most lighthouses are also equipped with radio beacons. The three types of1apparatus used to produce the signals are the catoptric, in which metal is used to reflect the light;0the dioptric, in which glass is used, and the catadioptric, in which both glass and metal are used.In the daytime, lighthouses can usually be identified by their structure alone. The most typicalstructure is a tower tapering at the top, but some, such as the Bastion Lighthouse on the SaintLawrence River, are shaped like pyramids, and others, such as the Race Rock Light, look likewooden houses sitting on high platforms. Still others, such as the American Shoal Lighthouse offthe Florida Coast, are skeletal towers of steel. Where lighthouses might be confused in daylight,they can be distinguished by day-marker patterns – designs of checks and stripes painted in vividcolors on lighthouse walls.In the past, the job of lighthouse keeper was lonely and difficult, if somewhat romantic.Lighthouse keepers put in hours of tedious work maintaining the lights. Today, lighthouses arealmost entirely automated with humans supplying only occasional maintenance. Because of2improvements in navigational technology, the importance of lighthouses has diminished. Thereare only about 340 functioning lighthouses in existence in the United States today, compared toabout 1,500 in 1900, and there are only about 1,400 functioning lighthouses outside the UnitedStates. Some decommissioned lighthouses have been preserved as historical monuments.