百脉一宗
参考答案：
解析：百脉泛指全身的血脉，宗即根本。百脉一宗指人体百脉，同出一源。
It was at four o'clock in the afternoon ____ he and his grandpa reached the museum in Guanghan.
A．while
B．that
C．when
D．as
岩浆矿床是（）主要结晶阶段所形成的矿床，伟晶岩矿床是岩浆结晶最后阶段的残余岩浆形成的矿床
