单项选择题

Theories have features that are (indicative) of their truth, and the. task of justification is to identify these features and (using them) to guide choices (as to) (which theories) to believe

A. indicative
B. using them
C. as to
D. which theories
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单项选择题
Another factor in the display of art objects (concerns their continued preservation). Because of the sensitivity of some of the materials (used in their creation), it is necessary to control (within narrow limits) the temperature, humidity, and lighting (which) they are exposed.
A. concerns their continued preservation
B. used in their creation
C. within narrow limits
D. which
单项选择题
There is nothing in science (stating) that it is good to attempt to save human lives. Saving human lives (seems) to be a (generally held) value in most cultures of the world, but it is not (in some sense) scientifically derived.
A. stating
B. seems
C. generally held
D. in some sense
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