C. Smoking is the most important cause of lung cancer.

抽烟是导致肺癌最主要的起因。

youdao

Rejection is the most important cause of corneal grafting failure.

排斥反应是角膜移植手术失败最重要的原因。

youdao

Invasion and metastasis is the most important cause of cancer mortality.

癌的侵袭和转移是引起癌症病人死亡的主要原因。

youdao

But most important is finding the cause of the disease so it can be prevented or cured.

VOA: standard.2010.08.09

In the realm of prevention, he says vaccination is the most important intervention against diseases that cause pneumonia, such as whooping cough and measles.

VOA: standard.2009.11.02

Orszag is convinced that rising federal health-care costs are the most important cause of long-term deficits.

NEWYORKER: Money Talks

Perhaps the most important cause of the thriving black economy is excessive regulation of labour and product markets.

ECONOMIST: Light on the shadows

Perhaps the most important cause of our economic malaise is that for years as a nation we have been living beyond our means, in deficit with the rest of the world, buying from other countries far more than we produce, till our indebtedness became unsustainable.

BBC: Why the chancellor wants China's cash