It is not long since conditions in the mines were worse than they are now. There are still

【C1】______a few every old women who in their youth have worked【C2】______, with harness round their waists, and a chain【C3】______passed between their legs, crawling on all【C4】______and dragging tugs of coal. They used to go on【C5】______this even when they were pregnant. And【C6】______now, if coal could not be produced without pregnant women dragging it【C7】______and fro, I fancy we should let them do it【C8】______than deprive ourselves of coal. But most of the time, of course, we should【C9】______to forget that they were doing it. It is【C10】______with all types of manual work; it keeps us alive, and we are oblivious of its existence. More than anything【C11】______, perhaps, the miner can stand as the type of manual worker, not only because his work is so exaggeratedly awful, but also because it is so vitally necessary and【C12】______so【C13】______, that we are capable【C14】______forgetting it as we forget the blood in our veins. In【C15】______way it is even humiliating to watch coal miners working. It raises in you a momentary doubt【C16】______your own status as an " intellectual" and a superior person generally. For it is brought【C17】______to you, at least while you are watching, that it is only【C18】______miners sweat their guts out【C19】______superior persons can【C20】______superior.

【C1】

A．alive

B．living

C．walking

D．breathing