题目内容：
根据材料请回答题:
Many American women have a poor knowledge of cancer.
参考答案：
答案解析：
单选题：根据材料请回答题:Many American women have a poor knowledge of cancer
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Many American women have a poor knowledge of cancer.
Many American women have a poor knowledge of cancer.
图示结构中，当A点作用外力P时，下述对D点变形特征的描述何者正确？ （ ）
图示结构中，当A点作用外力P时，下述对D点变形特征的描述何者正确？ （ ）
We all think that Mary’s husband is a very boring person.
We all think that Mary’s husband is a very boring person.
Which of the following is NOT a landmark?
Which of the following is NOT a landmark?
Ford' s cars b ,came available to ordinary people thanks to
Ford' s cars b ,came available to ordinary people thanks to
图示两刚架El均为常数，分别为EI=1，EI=10，则两刚架的内力关系为（ ）。
图示两刚架El均为常数，分别为EI=1，EI=10，则两刚架的内力关系为（ ）。