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o do ? T: How long does the spacecraft need to get to Mars at present? S: It takes months. Because our spacecraft are too slow to carry large numbers of people to Mars at present. too + adj.+ to do/... so ... that ... can’t .... /... adj. + enough to do ? . Sandy太年輕了而不能去上學(xué)。 Sandy is too young to go to school. Sandy is so young that she can’t go to school. Sandy is not old enough to go to school. 3. at the speed of T: How long does the spacecraft need to get to Mars in the future? S: By the year 2100, the journey might only take about 20 minutes in spacecraft that travel at the speed of light. . The speed of the light is 300,000,000 meter per second. The cars are driving at high speed. We should move at the speed of 100 kilometers per hour. 【設(shè)計(jì)意圖 : 通過(guò)問(wèn)題的創(chuàng)設(shè)與回答,自然 引出知識(shí)點(diǎn),并通過(guò)翻譯短語(yǔ)、自主造句等方式加以理解、鞏固 ?!? S