题目内容

IMC is an aviation flight category that ________ weather conditions that require pilots to fly primarily by reference to instruments.

A. describes
B. to describe
C. describing
D. describe

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______ VMC, pilots should fly by referring to outside visual references.

A. In
B. Under
C. At
D. On

In IMC conditions, pilots should fly by referring to _____.

A. visual references
B. sensations
C. instruments
D. landmarks

Specialized glasses can help pilots to _______ outside vision, forcing them to rely on instruments indications only.

A. broaden
B. maintain
C. protect
D. restrict

In VMC conditions, pilots should fly by referring to _____.

A. outside references
B. sensations
C. instruments
D. landmarks