2017 年虹口区高三英语二模卷 2017.04 II. Grammar and Vocabulary Section A Directions: After reading the passage below, fill in the blanks to make the passage coherent and grammatically correct. For the blanks with a given word, fill in each blank with the proper form of the given word; for the other blanks, use one word that best fits each blank. Loss of Biodiv ersity (生物多样性) Affects Human Society If a species of bee disappears forever or a particular plant is extinct, what does it have to do with us humans? Well, according to a team of international scientists, biodiversity is dropping below levels (21) ______ (consider) safe for the health and happiness of human societies. The issue is that everything is inter-connected and ecosystems support our societies (22) ______ they provide us with, for example, food, fibres and fuels. If species go on disappearing, this can disturb many vital processes (23) ______ crop pollination (授粉) and the decomposition (分解) of waste. A framework which defines the environmental limits within (24) ______ humans can really operate -- called planetary boundaries -- says (25) ______ (lose) more than 10% of the biodiversity in an area places the local ecosystem at risk. Ecosystems are all different but this percentage is considered as a good measure of safety. A study published in the magazine Science suggests that 58% of the world’s land surface (26) ______ (reduce) below this level already. These areas house 71% of the global population. Professor Andy Purvis, from Imperial College London and the Natural History Museum, is one of the authors of the study. He says, “Once we’re the wrong side of the boundary, (27) ______ doesn’t mean everything goes wro...
