题目解析:
教授说I think that’s right…这句话时语气不太确定。可推测,他询问是否有人打开了教材的原因是想确认刚刚自己提到的信息是否与书中的内容相吻合。因此D正确。
【对应原文】
I think of the 100,000 bald eagles that currently exist, um, about half that population lives in Alaska. So North America does have a... sizable population of bald eagles, [uncertainly] I think that's right... does anyone have their book open?