Geologists casually examined the rock strata, but their trained eyes quickly noted the unusual fossil pattern.
地质学家们随意地检查岩层，但他们训练有素的眼睛迅速注意到不寻常的化石图案。
Which choice best defines “casually”?
B — In a relaxed and informal way. “casually” means in a relaxed and informal way.
Which word means “in a relaxed and informal way”?
B — casually. “casually” means in a relaxed and informal way.
casually — in a relaxed and informal way. In Chinese: 随便地，非正式地.
casually is pronounced /ˈkæʒuəli/.
Geologists casually examined the rock strata, but their trained eyes quickly noted the unusual fossil pattern. (地质学家们随意地检查岩层，但他们训练有素的眼睛迅速注意到不寻常的化石图案。)
informally, nonchalantly, offhandedly — all close in meaning to casually (in a relaxed and informal way).
formally, deliberately — each the opposite of casually (in a relaxed and informal way).
Yes. casually is on the SAT Prep Basic list — the everyday academic words the SAT assumes you already have. The Digital SAT does not test vocabulary in isolation; words like this one are tested through Words in Context questions, where you choose the word that completes a passage most logically and precisely.