题目内容

I’ve got some very ______(excite) news for you.

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Sean’s ______(perform) at school has greatly improved.

You can ask your _____(advise) for help when selecting your courses at college.

广义表(a,b,c,d)的表头是( ),表尾是( )。

A. (a),(b,c,d)
B. (a),(a,b,c,d)
C. a,(b,c,d)
D. a,(a,b,c,d)

广义表(a,(a,b),d,e,((i,j),k))的深度为()。

A. 2
B. 3
C. 4
D. 5

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