【多选题】【消耗次数：1】
我国面临的主要生态环境问题
①
A.生态空间遭受持续威胁
②
B.生态系统质量和服务功能低
③
C.生物多样性加速下降的总体趋势尚未得到有效遏制
④
D.城乡人口比例下降，农村人口涌入大中城市
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【判断题】
生态系统是生物与环境构成的统一的整体，生态系统的多样性包括生物种类的多样性和生活环境的多样性，因此，生态系统的多样性受到影响时，会影响生物种类的多样性和基因的多样性基因的多样性
①
正确
②
错误
【单选题】
提升生态系统多样性、稳定性、持续性：要建立健全（），让保护修复生态环境获得合理回报。
①
A生态产品价值实现机制
②
B生活产品价值实现机制
③
C林业产品价值实现机制
④
D农业产品价值实现机制
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9. They have ______ each other for a long time.
①
corresponded on
②
corresponded with
③
communicated with
④
kept writing
【单选题】
6.The old lady fainted on the street and found herself in the first aid room when she came_________.
①
across
②
over
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in
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to
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In Britain, the season of the year is probably _____ spring.
①
later
②
last
③
latter
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late
【单选题】
All _____ is peace and progress.
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what is needed
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for our needs
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the thing needed
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that is needed
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_____ that my head had cleared, my brain was also beginning to work much better.
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For
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Now
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Since
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Despite
【单选题】
2. This machine is ______ being improved.
①
capable to
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able of
③
able to
④
capable of
【单选题】
3.The classroom was almost empty ______ a desk or two.
①
besides
②
except for
③
except
④
in addition to