填空题 Directions: There are 20 blanks in the following passage. For each blank there are four choices marked A, B, C and D on the right side of the paper. You should choose the ONE that best fits into the passage. Then mark the corresponding letter on Answer Sheet 2 with a single line through the center. Everybody uses the expression a.m. and p.m. to indicate before noon and after noon. But do you know (1) 1 what they mean, and how these terms (2) 2 into beings? (3) 3 you know, the turning of the earth makes the sun and the stars seem to move (4) 4 the sky. Daylight, of course, begins when the sun rises in the east and ends when it (5) 5 in the west. When the sun is high in the sky, between these two (6) 6, half of the daylight hours have been spent. (7) 7, by noticing where the sun stood in the sky, early (8) 8 knew he could tell the time of day. At night, the motion of the stars (9) 9 the same purpose. The important thing (10) 10 keeping time is to know the exact moment of noon. For each of us, (11) 11 we are, noon is when the sun is (12) 12 overhead. Think of an (13) 13 line, a meridian, drawn across the sky, (14) 14 from the north point of your horizon (15) 15 to the south point. When the sun (16) 16 your meridian, it is noon for you. While the sun is still (17) 17 of this line or meridian, it is morning. After the sun has crossed this meridian, it is (18) 18. The Latin word for "midday" is "meridies", from which comes our word meridian. (19) 19 a.m. is an abbreviation for ante meridian, or before midday, and p.m. is the abbreviation for post meridian, or after midday. Each of the world's time zones is about fifteen degrees (20) 20 in longitude, which is about the distance the sun moves through the sky in an hour. Everyone who lives in the same time zone observes noon at the same moment. 1.A、actuallyB、basicallyC、exactlyD、certainly 2.A、comeB、have comeC、cameD、had come 3.A、AsB、IfC、SinceD、Although 4.A、underB、towardsC、throughD、across 5.A、fallsB、dropsC、setsD、collapses 6.A、spotsB、positionsC、levelsD、posts 7.A、HoweverB、ThereforeC、FurthermoreD、Frequently 8.A、manB、womanC、personD、child 9.A、performedB、actedC、functionedD、served 10.A、atB、toC、inD、of 11.A、wheneverB、whereverC、whoeverD、whatever 12.A、nearlyB、directlyC、obviouslyD、especially 13.A、imaginingB、imaginableC、imaginativeD、imaginary 14.A、that stretchesB、to be stretchedC、stretchingD、being stretched 15.A、downB、upC、alongD、through 16.A、crossedB、will crossC、has crossD、crosses 17.A、southB、eastC、northD、west 18.A、nightB、eveningC、noonD、afternoon 19.A、SoB、FinallyC、LikewiseD、Yet 20.A、wideB、longC、deepD、high