A thin，whitish，high cloud popularly known as mares tails is（）.

单项选择题A strong，often violent，northerly wind occurring on the Pacific coast of Mexico，particularly during the colder months，is a（）.

A.Papagayo
B.fall wind
C.foehn
D.williwaw

单项选择题A strong，often violent，northerly wind occurring on the Pacific coast of Mexico，particularly during the colder months，is called（）.

A.Tehuan tepecer
B.Papagayo
C.Norther
D.Pampero

单项选择题A storm is forecast for the area where your vessel is moored. For its safety you should put（）.

A.more slack in the mooring lines
B.a strain on the mooring lines
C.chafing gear on the mooring lines
D.grease on the mooring lines

单项选择题A steep barometric gradient indicates（）.

A.calms
B.light winds
C.strong winds
D.precipitation

单项选择题A katabatic wind blows（）.

A.up an incline due to surface heating
B.in a circular pattern
C.down an incline due to cooling of the air
D.horizontally between a high and a low pressure area