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Tidal sites have already been identified (that will produce one sixth or more of the UK’s power)----and at prices （competitive with modern gas turbines）(现代汽轮机） and undercutting (削减）those of the already （ailing（境况不佳的））nuclear industry.What’s the trunk （主干）of the main sentence（主句） ?

A. SVO: Tidal sites will produce power
B. SV: at prices and undercutting nuclear industry
C. SV : Tidal sites have been identified
D. SVO: Tidal sites have been identified power

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Those （who are professionally engaged in the art of interpreting history） are thus in a difficult position, [ as they must steer(掌舵，平衡)a narrow course between the demands of ‘evidence’ and ‘attractiveness’ ], especially given（prep.考虑到） the increasing need in the heritage industry(遗产产业)for income-generating activities.What’s trunk (主干）of the main sentence（主句）?

A. SV: Those in a difficult position.
B. SVP: Those are in a difficult position.
C. SVOo: Those are in a difficult position.
D. SVO: Those are in a difficult position.

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Second, we make a [very] (conservative) assumption that we are looking for a life form (that is [pretty well] like us), [since if it differs radically from us] we may [well] not recognize it as a life form, quite apart from whether we’re able to communicate with it.What’s the trunk(主干） of the main sentence（主句）?

A. SVO：We make a(n) assumption
B. SVO：We are looking for a life form
C. SV：It differs
D. SVP：That is like us

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However，Lewis and Brooks-Gunn(1979) suggest that （1宾从）infant’s developing understanding that（2同位语从句）the movements (they see in the mirror )are contingent [on their own], leads to a growing awareness that(3同位语从句)-- they are distinct [from other people].What’s the trunk（主干） of the main sentence（主句）?

A. SVO: Lewis and Brooks-Gunn(1979) suggest that infant’s understanding leads to a(n) awareness.
B. SVP: Lewis and Brooks-Gunn(1979) suggest that infant's understanding.
C. SV: Lewis and Brooks-Gunn(1979) suggest that the movements are contingent.
D. SVO: Lewis and Brooks-Gunn(1979) suggest that they are distinct.

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Moving from water to land involved( v. 涉及) (a major) redesign (of every aspect(方方面面) of life), including breathing and reproduction(繁殖).What’s the trunk (主干）of this sentence?

A. SVO: from water to land involved redesign.
B. SVO: Redesign including breathing and reproduction.
C. SVO : Moving from water to land involved a redesign.
D. SV: Moving from water to land.

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A. SVO: Tidal sites will produce power B. SV: at prices and undercutting nuclear industry C. SV : Tidal sites have been identified D. SVO: Tidal sites have been identified power

Moving from water to land involved( v. 涉及) (a major) redesign (of every aspect(方方面面) of life), including breathing and reproduction(繁殖).What’s the trunk (主干）of this sentence?

A. SVO: Tidal sites will produce power
B. SV: at prices and undercutting nuclear industry
C. SV : Tidal sites have been identified
D. SVO: Tidal sites have been identified power