Comparatively the telephone charges are lower if you make a call ______. Which of the following statements is true?

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问题 Comparatively the telephone charges are lower if you make a call ______.
Which of the following statements is true?

选项 A、STD works with operators.
B、STD is popular all over the world.
C、STD is popular only in West Europe.
D、STD works without operators.

答案D

解析 细节推断题。根据文中第一段“... and calls connected by the operator are normally more expensive than calls you dial direct.”及第二段中“... Other calls will require the assistance of the operator.”可以推断 STD works without operators。
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