Why couldn't the radiation belt be found earlier?-考呗网

专四

单选题Why couldn't the radiation belt be found earlier?

A．Because visual angles are differen
B．Because spacecrafts didn't approach Saturn close enough in the pas
C．Because viewing spot matter
D．Because the spacecraft had no imaging magnetometer advanced enough in the pas

参考答案：C进入在线模考

【定位】第4段。
【解析】细节题。根据文章“先前探测土星的飞船没有到达适当的位置而没有作出如此发现。”说明先前飞船都没有如此的发现，是由于position不适当。选项C中的spot正是此义。
【点睛】此题有一定难度。注意理解viewing spot matters是“观察位置问题”之义。

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