题目内容：
根据以上资料请回答第13题：_________
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答案解析：
单选题：根据以上资料请回答第13题：_________
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回答听力第15题__________
回答听力第15题__________
The products of this factory are chiefly characterized by th
The products of this factory are chiefly characterized by their fine workmanship
根据以上材料，回答第50题___________
根据以上材料，回答第50题___________
The general placed the flag over the captain, leaving only h
The general placed the flag over the captain, leaving only his face (uncover) __
Both Marx and Engels were (German) __________.
Both Marx and Engels were (German) __________.