ACT真題每日一練12.18

　　Science Question for Friday, December 18th, 2015

　　Passage II

　　The Sun's path from sunrise to sunset varies with the time of year. A student performed the following experiments on three clear, sunny days at three- or four-month intervals throughout the course of a year to study the path of the Sun through the sky.

　　Experiment 1

　　At a chosen Northern Hemisphere location, the student placed a stick vertically into the ground so that 1 meter of its length was left above ground. The student knew that the length of the shadow was related to the height of the Sun above the horizon and that the shadow would point away from the direction of the Sun. The length in meters (m) and direction of the shadow cast by the stick were measured one hour after sunrise (Shadow A), at mid-morning (B), at noon (C), at mid-afternoon (D), and one hour before sunset (E) on each of the three days. The direction of each shadow was determined by placing a magnetic compass at the base of the stick and aligning the north arrow with the north mark on the compass. The direction of each shadow was then determined by a comparison with the compass face markings. The results are recorded in Table 1.

　　Based on the shadow directions in these experiments, which of the following best describes the difference between the apparent path of the Sun as seen from the observation points in the Northern and Southern Hemispheres?
　　————————————————————————————————————————————————

　　A. The Sun travels a more southerly path in the Southern Hemisphere than in the Northern Hemisphere.

　　B. The Sun travels a more northerly path in the Southern Hemisphere than in the Northern Hemisphere.

　　C. The Sun rises in the East and sets in the West in the Northern Hemisphere, but the opposite is true in the Southern Hemisphere.

　　D. The Sun rises in the West and sets in the East in the Northern Hemisphere, but the opposite is true in the Southern Hemisphere.

　　謎底：B.

　　【剖析】Comparing the data for the two hemispheres, 9 of the 15 shadows measured in the Southern Hemisphere point S, SW, or SE. This indicates that the Sun appeared north of that location at the times the shadows were measured. At the same times, the corresponding Northern Hemisphere measurements indicate the Sun was occasionally north of that location, but more often south of it.

　　More shadows in the Southern Hemisphere location pointed south than did shadows in the Northern Hemisphere location.

掃描二維碼，更多act備考材料一手控制!

　　佳構推舉：

　　ACT/" target="_blank">ACT名師專屬一對一課程 !

　　整日制高端學堂開課啦！