问题
单项选择题 A1型题
与乳腺癌的发生有密切关系的性激素是（）
A.雌激素
B.孕激素
C.雄激素
D.催乳素
E.胃泌素
答案
参考答案：A
解析：乳腺癌的真正病因和其他恶性肿瘤一样，尚不完全明确，但已被证明雌性激素的活性与乳腺癌的发生有密切的关系。
搜题请搜索小程序“爱下问搜题”
与乳腺癌的发生有密切关系的性激素是（）
A.雌激素
B.孕激素
C.雄激素
D.催乳素
E.胃泌素
参考答案：A
解析：乳腺癌的真正病因和其他恶性肿瘤一样，尚不完全明确，但已被证明雌性激素的活性与乳腺癌的发生有密切的关系。
完形填空（本题有15小题，每小题1分，共15分） 阅读下面短文，然后从各题所给的四个选项中选出一个最佳答案。  When high school started, Sally and I became best friends. We shared many interests and quickly became very close．When high school ended, we both cried because we would enter different 1 in autumn． Our first term of college life was 2 , so we often sent long e-mails and encouraged each other. We missed each other so much! In the second term, I found some new friends and I felt very 3 with them. These were friends with whom I could be myself and pour out my feelings. I was eager to share my new friends with Sally． When Sally 4 visited me at my school, we were excited. She brought a toy bear to me 5 a present and told me about her college life. 6 , something unexpected happened when I introduced her to my new friends．Her eyes grew dark and I could see the sadness in them．My new friends tried to share their friendship, but Sally seemed unwilling to accept it．I didn't understand 7 the people I loved most couldn't love each other． Sally left. I knew she was not happy. I thought long about what had happened. I asked her many questions but she didn’t answer me. I 8 that she was jealous. She saw me with my new friends and was afraid that we no longer shared the same experiences. She saw that I could still enjoy myself 9 her and wished she could be a part of it． I wrote Sally a letter to 0 she's always my best friend. I told her everyone had friends from home and friends from school, and all the friends were indeed life's greatest 11 ．Sally wrote me back soon. She was in agreement and felt sorry about 12 she had done． I think Sally and I both 13 an important lesson from it. Nothing can influence our 14_ and change the experiences we've shared．We are now walking on two different paths of life. While new friends are special and exciting, old friends are 15 there, waiting to share their heart, no matter how far away they are from each other．
|