2021年4月ACT北美卷科学部分共有6篇文章，其中两篇为Data Representation数据展示类。本期我们将梳理第二篇。
An experiment was conducted to determine how seawater temperature and salinity affect food consumption and growth in Scophthalmus maximus (a species of fish). The table shows, for each of 8 trials, average total food consumption, CT, and average gain in body mass for S. maximus kept at various temperature and salinity combinations. Each trial involved the same number of fish and lasted the same number of months.
7. Based on the table, for which 2 trials was the average CT value less than 50 g and the average gain in body mass greater than 75 g?
A. Trial 1 and Trial 2
B. Trial 1 and Trial 8
C. Trial 3 and Trial 4
D. Trial 3 and Trial 7
答案：D
解析：题目要求我们在表中找到CT值小于50g，同时average gain in body mass值高于75g的两组实验，选择D。这道题比较简单，但要注意在表中找数据时：1. 不要看错数值;2. 不要看错行。
8. Consider Trials 1−4. Based on the table, as salinity increased, did average CT increase or decrease, and did average gain in body mass increase or decrease?
average CT
average gain in body mass
F. increase decrease
G. increase increase
H. decrease decrease
J. decrease increase
答案：H
解析：题目要求我们在表中找到CT值和average gain in body mass值在前四组实验中的变化规律，两组数据都在下降，选择H。
9. Consider the 4 trials for which the average CT values were less than 45 g. What is the order of these trials from the trial with the least average CT value to the trial with the greatest average CT value?
A. Trial 5, Trial 6, Trial 4, Trial 7
B. Trial 5, Trial 6, Trial 7, Trial 8
C. Trial 7, Trial 8, Trial 5, Trial 6
D. Trial 7, Trial 4, Trial 6, Trial 5
答案：A
解析：题目要求我们找到在表中CT值低于45 g的四组实验，并按照CT值的大小从低到高排列。CT值低于45 g的四组实验分别为Trial 4、Trial 5、Trial 6和Trial 7，其中最低的为Trial 5，最高的为Trial 7，选择择A。数据排列题要注意排序的顺序，题目要求从低到高排序，不要因为漏看后半句而选反。
10. Based on the table, average gain in body mass was approximately how many times as great for the S. maximus in Trial 6 as for the S. maximus in Trial 5?
F. 1/5
G. 1/2
H. 2
J. 5
答案：H
解析：题目要求我们对比Trial 6的average gain in body mass值和Trial 5的average gain in body mass值。要注意凡是出现as…as…的比较关系时，后一个提到的是被比较的对象，故本题要求的是第六组的值是第五组的几倍，选择H。how many times as A as B = 求A是比B的多少倍
11. Suppose Trial 1 lasted 3 months. How many months did Trial 8 last?
A. 3 months
B. 8 months
C. 24 months
D. Cannot be determined from the given information
答案：A
解析：本题不再是直接的要求学生分析数据，而是考察了学生对于科学实验基本信息的理解。题目中提到了一个表中没有的信息，因此需要我们去仔细阅读表格前对于这项实验的基本介绍。根据介绍内容的最后一句可知，每组实验持续的时间是相同的，选择A。
12. What was the average CT, in kilograms (kg), for fish kept at a temperature of 22°C and a salinity of 25 ppt?
F. 0.0521 kg
G. 0.521 kg
H. 52.1 kg
J.52,100.0 kg
答案：F
解析：根据题目中提供的数据，我们可以在表中快速找到对应答案为52.1 g，但要注意选项中所有单位均为kg，因此需要单位换算，选择F。
总结：这是一篇生物类动物学文章，但实际做题并不需要我们掌握任何相关知识，着重考察了数据理解能力，要注意仔细审题，避免在对题目的理解上出现偏差。
相关单词积累：
salinity 盐度
consumption 消耗
Scophthalmus maximus 大菱鲆(俗称多宝鱼) |
