ACT真題每日一練2.6

　　Science Question for Saturday, February 6th, 2016

　　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.

　　Which of the following was a constant in both experiments?

　　F. Length of vertical stick exposed

　　G. Shadow direction

　　H. Day of the year

　　J. Shadow length

　　謎底：F

　　【剖析】The experimental design description states that a stick of a given dimension was used to create shadows of various lengths.

　　The experimental description states that, in all cases, 1.0 meter of the stick was left above ground. This was constant in both experiments.

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