At the end of every chapter in our science text, there is a group of______questions, intended for students who wish to go more d

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问题 At the end of every chapter in our science text, there is a group of______questions, intended for students who wish to go more deeply into the subject.

选项 A、optional
B、portative
C、optimistic
D、operational

答案A

解析 optimistic“乐观的”;optional“可选择的”:portative“可搬运的,可携带的”;operational“操作的,运用的”。根据题意,正确答案为A。
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