試題詳解

33. Which of the following sentences below expresses the essential information in the underlined sentence in paragraph 4?
(A) A chronometer could be used to determine when the Sun was going to rise.
(B) A chronometer could only be used to calculate longitude if one was traveling in a westerly direction.
(C) A chronometer was an inaccurate measure of time because of the movement of the ship.
(D)A chronometer could be used to measure longitude by combining knowledge about the rising Sun and accurate measurement of time.