题目内容

Whether a sentence is semantically meaningful is governed by rules called __________ restrictions, which are constraints on what lexical items can go with what others.

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A(n) __________ is a logical participant in a predication, largely identical with the nominal element(s) in a sentence.

叶绿素分子的叶醇基是（）化合物。

A.脂肪醇
B.倍半萜
C.二萜
D.单萜

叶绿素分子的头部是（）化合物。

A.萜类
B .Fe卟啉环
C.Fe吡咯环
D.Mg卟啉环

叶黄素分子是（）化合物。

A.单萜
B.倍半萜
C.二萜
D.四萜