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In Czechoslovakia, the “Prague Spring” had which of the following effects?

The quantum theory of energy developed by Max Planck raised fundamental questions about which of the following?

When did Khrushchev’s unpopularity with the Communist Party reach its apex?

The reunification of Germany was accomplished under whose leadership?

Among nineteenth-century European political movements, which of the following was the most responsible for triggering World War I?

All of the following led to decline in George W. Bush’s popularity by his second term as president EXCEPT which one?

The Triple Entente before 1914 included which of the following countries?

Nazi ideas about appropriate work for women encouraged them to pursue occupations in which of the following fields?

The tank was introduced by to the battlefields of World War I by whom?

The physicist Walter Heisenberg was most noted for which of the following?