像这道题，我应该怎么办。。

What differences between volcanoes on Venus and those on Earth does the professor mention? Click on 2 answers
A. Volcanoes on Venus are mostly shield volcanoes
B. Volcanoes on Venus emit thicker lava
C. Many volcanoes on Earth are concentrated in specific zones.
D. Many volcanoes on Earth show no volcanic activity

答案：AC
解析：（2’12”）定位句：But what's particularly interesting about these volcanoes is that most of the volcanoes here on Earth are not shield volcanoes.

A选项的同意重复 shield 我怎的事没听出来，那这个空就真选不到，各位这种情况，有啥指教没？