写作电影剧作必须运用（）思维进行构思创作，在想象中形成连续不断、结构独特、合乎逻辑、节奏准确的声画组合形象，俗称“过电影”。

A、结构技巧

B、蒙太奇

C、叙述技巧

D、表达技巧

Most computer systems are (16) to two different groups of attacks: Insider attacks and outsider attacks. A system that is known to be (17) to an outsider attack by preventing.
(18) from outside can still be vulnerable to the insider attacks accomplished by abusive usage of (19) users. Detecting such abusive usage as well as attacks by outsides not only provides information on damage assessment, but also helps to prevent future attacks. These attacks are usually (20) by tools referred to as Intrusion Detection Systems.

A．power

B．tights

C．authorized

D．common