请认真阅读下列短文，从短文后各题所给的A、B、C、D四个选项中，选出最佳选项。
Walk through the Amazon rainforest today and you will find it is steamy, warm, damp and thick. But if you had been around 15,000 years ago, during the last ice age, would it have been the same? For more than 30 years, scientists have been arguing about how rainforests like the Amazon might have reacted（反应）to the cold, dry climates of the ice ages, but until now, no one has reached a satisfying answer.
