问题补充：
单选题Whenwestartgazingintothenightskywithatelescope,soonwe’llbeastonishedbytherealization_______weandourworldarepartofthisgiantsystem.A.whichB.whetherC.thatD.as
答案：
C解析考查同位语从句。we and our world are part of this giant system.是realization的同位语，that在从句中不做成分。
