When we start gazing into the night sky with a telescope, soon we’ll be astonished by the realization _______ we and our world are part of this giant system.

A．which

B．whether

C．that

D．as

因销户、换卡收回的信通卡要及相关登记簿，并（）。

A．销毁磁卡

B．销毁存折

C．破坏磁条

D．在信通卡左上角剪角作废