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选修9《Warming up、Pre-reading、Reading、Comprehending》优质课PPT课件下载
Lead-in:
He made seven voyages during his lifetime and contributed greatly to the science of navigation in China. He travelled more than 50,000 km and visited 30 countries new to China and developed many trade links. He is considered one of the earliest
naval explorers in Chinese history.
We’re proud of these great navigators for
their great contributions to the world.
New words and expressions
voyage :long journey by sea or in space
mercy : kindness or forgiveness
at the mercy of : under the control of sb. or sth.
encyclopedia : book or set of books giving information about every branch of knowledge
exploration : activity of exploring
minimum : least or smallest
celestial :heavenly; of the sky
pole : point
New words and expressions
equator : imaginary line around the earth half between its north and south poles
horizon : line at which the earth and sky appear to meet
knot : a part where one or more pieces of string, rope ,cloth etc.
accelerate : speed up
log : thick piece of wood
magnetic : having the qualities of a magnet
precise : exact or accurate
Compass /' k?mp?s/
Astrolabe(星盘) /'?str?le?b/
Sextant(六分仪）/'sekstent/