根据材料并结合所学知识回答问题。

材料

     1981年，美国政府采取新遏制战略，“以实力求和平”。1982年，美苏开始了削减进攻性战略武器的谈判，但因美国在西欧部署中程导弹中止。1985年，苏联着手调整外交政策，美国推行新的缓和战略，双方重开谈判。1988年底，美苏达成了削减进攻性战略武器的初步协议。

    1991年7月，历经9年谈判，美苏签订了《削减进攻性战略武器条约》，规定双方削减核力量的1／3，各拥有1600件战略武器运载工具，苏联要从现有导弹中减少36％，美国减少29％：苏联减少现有弹头的41％，美国减少43％。

                                                                                                                                               ——据方连庆等主编《战后国际关系史》

    Many people don't consider their breakfast without a glass of milk. Right now, cows, buffalos, goats and sheep provide most of the world's milk. But soon, people could get milk from roaches(蟑螂).

    That isn't as crazy as it might sound. New research shows this “milk” is super-nutritious. What's more, some scientists have already begun referring to a lot of insects as source of milk.

    In 2004, Subramanian Ramaswamy started studying milk crystals found inside the roach. At the time, he was teaching biochemistry at the University of Iowa City.

    To learn more about the milk crystal from roaches, the scientists used X-rays to look at the atoms in it. The data basically revealed the chemical recipe of the roach crystal. They showed that roach milk is a “complete food”. It contains sugar with a fatty acid stuck to it. Fatty acids are the building blocks of fats. The protein in the milk is also full of essential amino(氨基的) acids, which are the building blocks of proteins. Since our bodies can't produce the “essential” ones, we need to get them from our food. And so do baby roaches.

    Barbara Stay, a biologist at Iowa University, also worked on the new study. She says the new data show that the roach milk is “three times more nutritious than cow's milk and four times more nutritious than buffalo's milk”.

    Ramaswamy would like to see roach milk turned into a protein supplement to feed hungry people. But not everyone is confident that it can be done.

    Marcel Dicke studies insects as a potential source of human food at Wageningen University in the Netherlands. Dicke says this is a “sound study”. However, in his opinion, “Extracting(提取) milk from roaches can only likely be done in a destructive way with only small quantities”. That means you'd have to raise and kill many bugs to get even tiny quantities of the milk.

    A young man wandered through the desert for forty until he reached a beautiful castle at the top of a mountain. There lived the sage that he was looking for.

    With considerable patience, the sage listened attentively to the reason for the boy's visit, but told him that at that moment he did not have time to explain to him the secret of happiness.

    He suggested that the young man take a walk around his palace and come back in two hours' time.

    “However, I want to ask you a favor,” he added, handing the boy a teaspoon, in which he poured two drops of oil. “While you walk, carry this spoon and don't let the oil spill.”

    The young man began to climb up and down the palace staircases, always keeping his eyes fixed on the spoon. At the end of two hours he returned to the presence of the wise man.

    “So,” asked the sage, “did you see the Persian tapestries hanging in my dining room? Did you see the fantastic garden that the Master of Gardeners spent ten years in creating?”

    Embarrassed, the young man admitted that he had seen nothing.

    “So, go back and see the wonders of my world,” said the wise man. “You can't trust a man if you don't know his house.”

    Now more at ease, the young man took the spoon and wandered again through the palace, this time paying attention to all the works of art that hung from the ceilings and walls. He saw the gardens, the mountains all around the palace, and the delicacy of the flowers. Returning to the sage, he reported in detail what he had seen.

    “But where are the two drops of oil that I entrusted to you?” asked the Sage.

    Looking down at the spoon, the young man realized that he had spilled the oil.

     “Well, that is the only advice I have to give you,'' said the sage of sages. “The secret of happiness lies in looking at all the wonders of the world and never forgetting the two drops of oil in the spoon.”

①水分子通过植物细胞的细胞壁  ②水分子通过植物细胞的细胞膜

③蔗糖溶液通过植物细胞的细胞壁   ④水分子通过液泡膜

⑤大豆种子浸入清水中吸水     ⑥水分子通过细胞的原生质层

⑦暂时萎蔫的青菜放人清水中后变得挺直