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Question 1:
In World War I, the Germans used large amounts of poison gas against their enemies. In 1915 a large poison gas attack by Germany against the Russians failed. Why?
A. The German howitzers could not move in marshland.
B. The poison gas was dispersed by the very moist Russian summer.
C. The smog in Russia meant that the artillery shells were fired without knowing where to aim.
D. Because of the Russian winter the shells froze.

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