單項(xiàng)選擇題

Hurricane warnings are issued（）when winds of force 12 or above are expected.

A.in all parts of the world
B.in some parts of the world
C.from all corners of the world
D.from every corner of the world

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單項(xiàng)選擇題

High pressure ridge（）from Sevastopol to eastern Libya.

A.reaching
B.extending
C.increasing
D.upgrading

單項(xiàng)選擇題

High clouds，composed of small white flakes or scaly globular masses，and often banded together to form a mackerel sky，would be classified as（）.

A.cirrus
B.cirrocumulus
C.altostratus
D.cumulonimbus