Explanation for Question 37 From the Writing Section on the 2020 October Sat
So question 37 asks us which choice in this effectively introduces the events recounted 2 in the paragraph. So let's look at what happens in the paragraph. 3 Right? We have one sample, 4 not sure quite yet what the sample was, 5 but it was stored in the dark for eight hours with CO2 and 6 then it was called pre illuminated. And then you remove the air and the 7 samples are exposed and oh, 8 okay. So we see allergy. So it looks like the samples might be algae 9 five minutes later, the algae samples were killed. 10 Yeah, there we go. So now we know what we're really talking about here, 11 samples, and more specifically, we're talking about algae samples and we see this come 12 up in D right. We begin with two samples of living algae. 13 So that appears to be what we talked about. So if we're in a 14 rush, we can just choose D and move on. 15 Let's go ahead and talk through why the other ones are wrong. Right. 16 Did we see anything about carbon labeling in this paragraph? 17 Nope. So a is not a good introduction. 18 B one advantage of using single cell algae rather than 19 other kinds is it can be measured with pipette. 20 So here we do talk about algae, but did we talk about the different 21 types of cells, right. Singular or multi-celled? 22 Nope. We just talked about having two samples. 23 So this is way too specific because we don't talk about this. 24 We don't talk about being single celled. And finally see the question was, 25 did light need to shine on plants while they were breaking bonds between carbon 26 and oxygen atoms. So I do talk about light, 27 but here it just says plants, right? And we're specifically talking about our algae 28 samples and this paragraph. So it makes sense that we should want to say 29 something about algae. So C is a little bit too long, 30 too specific without talking about the allergy. 31 Our best answer is going to be D.