2. 外语
  3. There are several differences between the composition of river water and______of seawater.

There are several differences between the composition of river water and______of seawater.

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问题 There are several differences between the composition of river water and______of seawater.
选项 A、that
B、some
C、those
D、both
答案A
解析 That agrees with its referent, the composition.
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