15. Worldwide demand for more _____ technology continues to grow.
A. subtle B. experienced C. sophisticated D. refined
sophisticated 复杂的、久经世故的
subtle 巧妙的、黯宛的、不明显的、不显著的、细微的、精细的
sob 哭泣
sorrow 痛苦
experienced 有经验的
refine 提炼、提纯
define 下定义、有限的
indefinite 无限的、不确定的
confine 限制
affinity 亲密