（ ）is a collection of data sets, which is so large and complex that it becomes difficult to process using on-hand database management tools or traditional data processing applications.

A. Big data

B. Cluster

C. Parallel computing

D. Data warehouse

虫媒花植物的花具有以下哪些结构特点使其能够吸引动物为其传粉？（　　）

A．鲜艳的色彩

B．柱头常有黏液

C．甘甜的花蜜

D．芬芳的气味