Complete each sentence with the correct ending, A-F, below.Write the correct le

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问题 Complete each sentence with the correct ending, A-F, below.
Write the correct letter, A-F.
A is not necessarily valid.
B provides grounds for an optimistic outlook.
C exists in the form of physical structures.
D is potentially both positive and negative.
E will not provide direct solutions for present problems.
F is greater now than in the past. [br] The number of environmental problems that societies face

选项

答案 F

解析 PARAGRAPH 5 ’These environmental problems include the same eight that undermined past societies, plusfour new ones ...’
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