Explanation for Question 44 From the Reading Section on the 2019 May Sat
Question 44 asks the main purpose of the discussion of blue and green lasers 2 is to do what. So let's look back in the passage at where they 3 introduce and talk about these blue and green lasers and see what they have 4 to say. So we can find this information in the second 5 paragraph. It's kind of long. It says Dabiri and will homeless use green or 6 blue and green lasers to induce thousands of five millimeter long brine shrimp to 7 migrate to. And from the bottom of a 1.2 meter deep tank. 8 So they're using these lasers to control the movements of the brine shrimp. 9 It goes on to say the creatures are strongly attracted to those colors. 10 The researchers shown the blue laser in the tank and moved it slowly up 11 and down to control the crustaceans vertical movements. 12 The tank solid walls could strongly affect the flow patterns generated by the shrimp 13 as they swam. 14 So the researchers kept the shrimp away from the edges of the tank by 15 shining the green laser directly down into the center. 16 So basically what we can see with these blue and green lasers is that 17 their purpose is to control where these brands shrimp go 18 in, where they don't go, 19 right? You don't want them near the solid walls. 20 So you put the green down the middle. So if we look at the 21 answer choices here, answer choice a says to explain 22 how the researchers were able to see this world made by the brine shrimp 23 answer choice is going to be incorrect. 24 You can see later that they...