which make the earth warmer.”可知，人们的活动引起了温室效应。故选D。 49.B 由文中第三段的“The change of the climate makes the earth warmer. In turn, the warmth of the earth changes the climate, too.”可知选B项。 50.B 本文主要告诉我们要保护地球。故选B。 Ⅳ. 51.snowing 根据句意知，正在下雪。 52.photos take photos意为“照相”。 53.hot hot意为“热的”。
54.sunny 根据上句句意知，天气是晴朗的。 55.weather
56.cloudy cloudy为形容词，意为“多云的”。 57.countries country意为“国家”。
58.Pretty pretty作副词，修饰其后的形容词good。 59.winter winter 冬天。 60.vacation on vacation在度假。 Ⅴ. 61.riding
62.joining 63.cloudy
67.take a message
64.does
65.photos
Ⅵ. 66.How’s,in 69.on vacation
68.How’s,going
70.having a good/great time
Ⅶ.One possible version: Dear Miss Brown, How is the weather in London? Does it often rain? The weather here is Miss Brown fine. The trees are green and flowers are 153 Park Street, red. Welcome to China. Meimei
London, England
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