分析有关科学探究的资料，回答问题。

【研充背景】越来越多的研究证实，从酵母、果蝇到哺乳动物小鼠，饮食限制能显著延长成年生物体的寿命。

【提出提问】日常饮食成分复杂，究竞哪种成分与寿命延长相关？

【形成假设】限制食物中的某种成分会显著影响成年小鼠的寿命。

【实验设计】为证明上述假设而设计的实验记录如表3所示。

【实施实验】对照组喂养正常食物（Y₀），实验组限制食物中的某种成分，然后记录小鼠的存活情况（即检测参数Z）。

阅读短文，从每题所给选项中选出可以入空白处的最佳选项。
    Last week Lu visited England. He stayed with my grandmother. He said it was a strange visit. “I don't understand, but I1your grandmother a lot. When I arrived, I gave her a 2from Suzhou. She looked in it and asked me to take it back. Then I saw a red spider(蜘蛛) on the table so I killed it for her and she seemed very 3. Do English people like spiders?”
    “Later we went shopping. Someone was painting a shop 4, so there was a ladder. Grandmother5me walking under it and said I must walk around it. I liked the shops and bought a smart 6for my father and some new shoes for myself. When we got back, I put the shoes on the table and opened the umbrella to wonder 7it was all right. Your grandmother came in and 8!”
    “Then I broke a small 9 in the bathroom. Your grandmother’s face went white. I felt very sorry. When I left I gave 10grandmother some flowers. She counted and there were 13. She 11it. I think she was happy I was going.”
    I 12to Lu, “My grandmother follows the old customs(习俗). You must not give someone an empty purse 13they will have no money. You must not kill a “money spider”or the same will happen. It is very unlucky to walk under a ladder and to put new shoes on the table. A(n)14umbrella in a house means someone will die. Breaking a mirror brings seven years’ bad luck, and 13 is 15a very unlucky number. You were really making my grandmother very afraid. ”

在解决一些环境问题的措施中，不可取的是（　　）

无性生殖和有性生殖的本质区别是（　　）