题目

阅读下列短文，从每题所给的A、B、C、D四个选项中选出最佳选项。While elephants born without tusks (长牙)are not unheard of, they normally form just 2 to 6 percent of the population. However, that is not the case at Mozambique's Gorongosa National Park, where an astonishing 33 percent of female elephants born after the country's conflict ended in 1992 are tuskless. While that may appear to be just a coincidence, Joyce Poole, an elephant behavior expert, has another theory. The researcher thinks we may be witnessing unnatural evolution of the species due to the constan18．（1 ）根据统计图．你能判断出一年气温变化的趋势吗？（2）有一种植物的生长期为5个月，最适宜的生长温度为7-10°C之间，这种植物适合在哪个地方种植？（3）小锌住在甲地，他们一家要在十一黄金周去乙地旅游．你认为应该做哪些准备？