70. What does the statement “there is an ideal window of time to acquire language in a linguistically rich environment, after which additional language acquisition becomes much more difficult” refer to?
(A)Critical period hypothesis.
(B)Field sensitivity.
(C)Whorfian hypothesis.
(D)Field independence.

薩丕爾-沃夫假說（英語：Sapir–Whorf hypothesis、語言相對論，Linguistic relativity）是一個關於人類語言的假說，由語言學家兼人類學家薩丕爾（Edward Sapir）及其學生班傑明·李·沃夫（Benjamin Whorf）所提出，是一門心理學及語言學的假說。這項學說認為，人類的思考模式受到其使用語言的影響，因而對同一事物時可能會有不同的看法，不過這項學說引起了一些爭議，也招致了一些批評。

現今有一些人造語言的發明的部份而生，如邏輯語、道本語等。

語言相對性原理（薩丕爾-沃夫假說）認為不同語言裡所包含的文化概念和分類會影響語言使用者對於現實世界的認知，也就是說不同的語言的使用者會因語言差異而產生思考方式，行為方式的不同。這個語言結構影響語者認知結構的說法涉及到人類語言學，心理學，語言心理學，神經語言學，認知科學，語言人類學，語言社會學，語言哲學等多個領域並在這些領域中被廣泛學習。

此假說已被臺灣高中公民教科書採用。

Field dependence is a concept in the field of cognitive styles. It is a one-dimensional model of variation in cognitive style. The concept was first proposed byHerman Witkin (an American psychologist) in 1962. Field dependence/independence was the earliest studied area in the study of cognitive styles.

In general, people who exhibit field dependence tend to rely on information provided by the outer world, the field or frame of a situation and their cognition (toward other things) is based on this overall field.