rECEntly, grEAt ADvAnCEs hAvE BEEn mADE in thE stuDy oF vEnus' surFACE By thE usE oF rADAr wAvEs to______ thE DEnsE ClouD lAyEr.
A．pErsECutE
B．piErCE
C．pEnEtrAtE
D．plungE