18-10AS 阅读 Q30

此题问与图一相比，用图二分析趋势受到什么的局限。图一是历年的数据，图二只有两个时间点的数据。相比图一，图二的数据少，且不连续，不如图一分析趋势那么一目了然，选A：Figure 2 presents data from two collection periods only, separated by several years，whereas Figure 1 tracks data over a continuous time span. B选项：Figure 2 provides evidence obtained from fewer methods of trapping fish，没有提及。C选项：Figure 2 is based on censuses of the reserves only，没有体现出普查的方法。D选项：Figure 2 represents research on commercial species only，没有提及只捕获商业鱼类，不符合。