选择题：24.American food aid could be cut off if South Afr

题目内容：
24.American food aid could be cut off if South Africa carries out its threat to ______. (American Food Aid Threatened)
A)ban imports of US grain
B)retaliate American civil rights movement
C)ban exports of US grain
D)retaliate US sanctions
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28. The Pentagon’s reaction is based on _______. (

28. The Pentagon’s reaction is based on _______. (Pentagon’s Comment on Soviet W

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如图 a 所示，在物体上作用有两力偶ex_1258954967723_0.jpg 和ex_12589

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