题目内容

How do doctors test for a lung cancer?

A. a high-tech screening test
B. routine blood test
C. routine urine test
D. routine physical examination

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How do doctor screen a heavy smoker for a lung cancer?

A. These heavy smokers have been screened with chest X-ray.
B. These heavy smokers have been screened with CT scan.

Why do doctors always suggest their patients to take the lung cancer screening test earlier?

网络安全就是网络上的（）安全，是指网络系统的硬件、软件及其系统中的数据受到保护，不因偶然的或者恶意的原因而遭到（）、更改、（）、系统连续、可靠、正常的运行，网络服务不中断。

全方位的、整体的网络安全防范体系分（）的。