A sudden knock on the laboratory door interrupted the scientist's precise measurement of the chemical reaction.
实验室门上突然的敲门声打断了科学家对化学反应的精确测量。
Which choice best defines “knock”?
B — Hit a door for attention; hit. “knock” means hit a door for attention; hit.
Which word means “hit a door for attention; hit”?
C — knock. “knock” means hit a door for attention; hit.
knock — hit a door for attention; hit. In Chinese: 敲，撞击.
knock is pronounced /nɒk/.
A sudden knock on the laboratory door interrupted the scientist's precise measurement of the chemical reaction. (实验室门上突然的敲门声打断了科学家对化学反应的精确测量。)
rap, tap, strike — all close in meaning to knock (hit a door for attention; hit).
caress, stroke — each the opposite of knock (hit a door for attention; hit).
Yes. knock 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.
knock(knock).