As our Earth’s temperature warms up because of climate change, it is having unexpected effects on ou

阅读下面短文，从每题所给的A、B、C、D四个选项中选出可以填入空白处的最佳选项。
As our Earth’s temperature warms up because of climate change, it is having unexpected effects on our world’s forests. When temperatures rise, trees close their skins to _____21_____ the loss of water, and this, in turn, slows down the _____22_____ of photosynthesis(光合作用). As a result, these trees are shorter and grow slowly, as well as have a _____23_____ death rate.
Climate change also increases the _____24_____ of droughts and wildfires. After wildfires, it takes a while for the forest systems to _____25_____ , and in some cases, the forests are _____26_____ permanently. Trees that are stressed are also _____27_____ to attacks by bacteria(细菌). In tropical forests, vines that use the trees as _____28_____ can often choke the trees and rob them of nutrients. Finally, humans have _____29_____ the forest landscape through logging. When trees are replanted on the soil, they will never grow as large as the ______30______ trees that were cut down.
As these forests disappear, species that once called them “home” are forced to change, ______31______ the variety of those systems. ______32______ , some endangered species are unable to ______33______ and die. Old-growth forests are disappearing in all regions of our world. When forests die, younger forests that are reestablished in the same area grow back weaker and smaller ______34______ poor vegetation. With trees dying increasingly and continuously, will future generations ______35______ out on the wonders of forests?
21. A. protect B. prevent C. save D. free
22. A. movement B. situation C. process D. operation
23. A. higher B. firmer C. lighter D. smaller
24. A. choice B. measure C. qualification D. chance
25. A. grow B. rescue C. recover D. decline
26. A. ignored B. lost C. hurt D. left
27. A. accessible B. enjoyable C. acceptable D. favorable
28. A. attention B. command C. trust D. support
29. A. frightened B. paid C. ruined D. wasted
30. A. common B. original C. distant D. strong
31. A. affecting B. improving C. forgetting D. reflecting
32. A. Besides B. Surprisingly C. Otherwise D. Unfortunately
33. A. devote B. keep C. adapt D. lead
34. A. due to B. in addition to C. instead of D. in spite of
35. A. pass B. miss C. break D. bring
【答案】21. B    22. C    23. A    24. D    25. C    26. B    27. A    28. D    29. C    30. B    31. A    32. D    33. C    34. A    35. B
【解析】