159. Because playing a musical instrument increases brain activity, it is sometimes used as ______ to promote learning in children.
A. condition
B. highlight
C. stimulus
D. dictum
E. respite

160. The ambassador argues that in diplomacy, there is a subtle but important difference between a country's showing a willingness to ______ and a too-obvious readiness to make ______ .
A. negotiate, concession
B. antagonize, friends
C. surrender, enemies
D. dominate, inquiries
E. equivocate, denunciations

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