下图为我国某平原生态农业种养结合模式图，读图回答下列各题。

    Students these days often have a lot of worries. Sometimes they have 1 with their schoolwork, and sometimes with their friends. Some people think the worst thing is to do 2 Laura, a teenager from America agrees. "Problems and 3 are normal in life, says Laura." But I think 4 to someone helps a lot. If we don't talk to someone, we'll certainly feel 5."

    Laura once lost her purse and worries for days. She was 6 to tell her parents about it. She even 7 three miles to school each day because she didn't have any money. She just kept thinking, "if I tell my parents, they will be angry!" But 8 she talked to her parents and they were 9 understanding. "Why not tell me earlier?" smiled her father. He said he sometimes made careless mistakes himself. So they got her a new 10 and asked her to be more careful. "I will always 11 to share my problems in the future!" Laura says.

    Robert Hunt, an expert, advises students about common problems. He feels the same way as Laura. "It's the best not to 12 our problems. We should always try to solve them." He thinks that you can first find someone to talk to, and the person 13 be an expert like him. Students often forget that their 14 have more experience, and are always there at home to help them.

    In English, we say that 15 a problem is like cutting it in half. So you're halfway to solve a problem if you talk to someone about it!

材料一：欧洲的朗姆酒、布匹、枪炮及其它金属品被运到非洲，非洲的奴隶被运到美洲，美洲的蔗糖、烟草和金银被运到欧洲。……16、17和18世纪，亚洲仍然对欧洲商品不感兴趣，而欧洲则勉强地用金银去支付他所需要的亚洲产品（丝绸、茶叶、香料等）。

——斯塔夫里阿诺斯《世界通史》

材料二：乾隆五十七年，英国马嘎尔尼使团以为乾隆祝寿为名，向清政府提出派使臣常驻北京，开放宁波、舟山群岛、天津为贸易口岸，遭到拒绝……并带来了大批科学仪器作为礼物，希望以此引起清朝的重视。但清政府却将这些先进的科技成就一概视为“奇巧淫技”，并认为“天朝德威远被，万国来王，种种贵重之物，梯航毕集，无所不有，……从不贵奇巧，并无更需尔国制办物件。”

——《鸦片战争前的中国和英国》

材料三：鸦片战争后，西方国家对中国的商品输出猛烈增加。中国进口的货物，第一是鸦片，第二是纺织品。1885年以后，棉纱和棉布的进口值超过鸦片进口值。中国出口商品仍然以传统的丝、茶为大宗。19世纪70年代以后，中国对外贸易逐渐由顺差向逆差转变。

——赵德攀《中国近现代经济史》