03 完形填空-2020年上海市高三英语二模专项汇编

03-2020年上海市高三英语二模专项训练之完形填空 金山区 Section A Directions: For each blank in the following passage there are four words or phrases marked A, B, C and D. Fill in each blank with the word or phrase that best fits the context. If you like to take a walk in the woods in the United States or you prefer to decorate a tree at Christmas, you should know that climate change is making both of those activities a lot more ____41____. Looking at two ____42____ and economically important species -- the Douglas fir and the Ponderosa pine -- scientists found that fires and drought _____43_____ by climate change make new growth difficult, especially in low-elevation forests, according to a study published Monday in the Proceedings of the National Academy of Sciences. Some forests in four regions in California, Colorado, the Northern Rockies and the southwestern part of the United States have crossed “a(n) ____44____ climate tipping（转折）point for post-fire tree generation,” the study says. Climate conditi