Currently, the biggest problem that pandas face is the loss of their natural habitat. This loss is mainly due to deforestation. Because of rapid population growth in the past decades, large areas of natural forest __(36)__ for agriculture timber and human housing. As settlers push up the mountain slopes, panda habitat __(37)__ disappears. Deforestation also threatens the pandas food supply. Pandas feed mainly on bamboo, __(38)__ up to 38 kilograms a day. Without enough forest area, the pandas will starve. __(39)__, every 60 years or so the bamboo in a certain area may naturally bloom and die off. It will __(40)__ several years for the new bamboo shoots to grow back. During this time, many wild pandas have to search for other areas to live in. However, deforestation now leaves them with nowhere else to go. 【題組】39. (A) To be sure (B) To begin with (C) To sum up (D) To make matters worse
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