You should go to see him when he is so seriously ill.________, he is your brother.

A．Because

B．After all

C．At all

D．Above all

铜芯导线或电缆的截面在1区为（）以上，2区为（）以上。

A.1.5mm²，2.5mm²

B.2.5mm²，1.5mm²

C.3.5mm²，1.5mm²

D.1.5mm²，3.5mm²