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[说明] 根据下面所给的AAA数据库，或者按照下列所给的每条SQL查询语句写出相应的功能，或者按照下列所给的每种功能写出相应的SQL查询语句。假设使用名称为AAA的数据库，它包括Students(学号char(8)，姓名varchar(8)，年龄 int，专业varchar(20)，入学日期Date Time)和Score(学号char(8)，课程名varchar(10)，成绩 numeric(5，2))两张表。 [问题4] 请写出一条查询语句，要求显示出Score表中的全部数据，并要求当成绩为空时显示数值-1。

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But the developing countries may be impoverished, with populations growing so rapidly that using the land is a means to temporarily avoid worsening poverty and starvation. (Lines 13-15, Para. 1, Passage 3)

What is the speaker’s mainly discussing

A. The importance of anthropology to modem society.
B. A good source of information about a society.
C. Attitudes toward culture in the 1940’s.
D. The relationship between anthropology and the military.

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One suggestion that has been made in order to maximize the efficiency of the system is to allow districts that have an overabundance of pending cases to borrow judges from other districts that do not have such a workload. ( Lines 1-3 , Para. 2, Passage 4 )

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Useful as computers today are, they’re nowhere close to achieving anything remotely resembling humanlike behavior. ( Lines 3-4, Para. 1, Passage 2)

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