By moving the radar beam around slowly in circles, we can ____ the surroundings.
A. explore B. expose C. exploit D. expand
出自:湖南大学-大学英语(高升专)

完成拼图验证

按住下方滑块,将拼图拖到缺口处后松开。

拼图背景,将小拼图拖到缺口处
向右拖动滑块