当某国汇率受到投机性袭击时，该国政府被迫扩大外汇储备，大幅度地提高利率。这主要反映了（）。

A.货币危机

B.银行危机

C.债务危机

D.系统性金融危机

When you doubt the existence of risk of collision,（）.

A.such risk shall be deemed to exist

B.Such risk shall not be deemed to exist

C.You should keep your course and speed

D.You needn‟t take any action to avoid collision with any vessel