阅读下面短文，在空白处填入 1 个适当的单词或括号内单词的正确形式。 In Gangba village, Xizang autonomous region, a group of Tibetan women are weaving (编织) age-old traditions with modern demands. Their hands turn locally ____ (source) fine wool into beautiful Tibetan rugs, scarves and other handcrafted cloths. Once ____ hobby practiced mainly during farming off seasons, Tibetan weaving has now grown into a blooming industry, becoming a driver of rural revitalization (振兴). For generations, women wove cloths for family members, ____ (hand) down techniques between generations. Yet ____ standardized production or market access, these skills remained undeveloped, generating little economic benefit for locals. A turning point came in 2015 with the founding of the local weaving cooperative. "We started with insufficient funds, a shortage of staff ____ little experience," said Basang Tsering, Party secretary of Gangba village. "But we ____ (sink) deep roots in the village to preserve this time-honored craft and pass on local culture. More importantly, we aimed ____ (help) rural women secure jobs and boost their income without traveling far from home," Basang Tsering said. With professional support and village authorities' ____ (guide), the cooperative has made good progress in recent years. It has overcome bottlenecks, expanded its sales, and developed modern designs, ____ include hats, embroidered (刺绣) bags and decorative key chains. These ____ (commerce) efforts have empowered women through stable incomes while renewing cultural pride.

你校英语报“Voices”栏目正在征稿，请同学们就“学校是否应该用零食、文具 (stationery) 等物质奖励来激励高三学生”发表看法，并阐述理由。 请你写一篇短文向该栏目投稿。 注意： 1. 写作词数应为 80 左右； 2. 请按如下格式在相应位置作答。 My Opinion on Material Rewards for Senior Three Students

阅读下面材料，根据其内容和所给段落开头语续写两段，使之构成一篇完整的短文。 Grandpa handed Toby a small whistle (哨子) carved out of thick animal bone. Its surface was worn smooth by years of use. “This is a winter whistle,” Grandpa explained. “If you are ever lost in the woods when it snows, blow this. The sound carries far across snow-covered ground. We will hear you and come find you.” Toby slipped it deep inside his winter-coat pocket, “I’m 12, and I no longer need to call for help!” To him, blowing the whistle would mean admitting he was not brave enough. That weekend, Toby went snow-trekking (雪地徒步) in the nearby forest with his best friend Jax. But an argument broke out between them over a silly game. Toby stormed off in anger, leaving Jax behind. He told himself he did not need anyone’s company. He would explore deeper into the woods alone to prove how tough he was. But the sun began to set. Grey clouds rolled in unexpectedly. A bitter winter wind sprang up. Snow began to fall in thick, swirling flakes. The gentle afternoon snow quickly turned into a snowstorm. Visibility dropped sharply. Toby could no longer tell which path led back home. He was lost. Cold bit through his gloves and his winter jacket. His cheeks and nose ached from the bitter wind. Panic rose inside his chest. He pulled his hands out of his gloves and fumbled (摸索) inside his coat pocket. His fingers closed around the hard shape of Grandpa’s whistle. It was right there. But shame washed over him. He had run away after the fight. If he blew the whistle, Grandpa and Jax would know he had acted stupidly. They would laugh at him for getting lost. Pride held him back. He stuffed the whistle back into his pocket and told himself he could find the way home by himself. He struggled forward through the heavy snow. The wind howled, blowing snow into his eyes. The temperature kept dropping. Still, the whistle stayed safely hidden in his pocket. As it was getting dark in the snowy woods, Toby felt close to passing out from the cold. He had to hide behind a large pine tree for shelter. 注意： 1. 续写词数应为 150 左右； 2. 请按如下格式在答题卡的相应位置作答。 Inside his pocket, the bone whistle pressed against his hand. The sound of the whistle drew anxious Grandpa and Jax over.

下列关于细胞学说的叙述，正确的是（ ） A. 细胞学说的建立是基于大量观察事实并运用了完全归纳法 B. 荷兰科学家列文虎克用自制的显微镜观察到了细菌、红细胞等，为细胞学说的建立提供了重要证据 C. 德国科学家施莱登和施旺通过观察动植物细胞，提出了“细胞是生命活动的基本单位，一切生物都由细胞构成” D. 细胞学说的建立使人们对生长、生殖、发育等生理现象的认识深入到了分子水平

下列关于“检测生物组织中的糖类、脂肪和蛋白质”实验的叙述，正确的是（ ） A. 由于斐林试剂与双缩脲试剂的成分相同，经稀释处理可用斐林试剂的甲液和乙液来鉴定蛋白质 B. 检测还原糖时，若向组织样液中加入斐林试剂后未出现砖红色沉淀，说明该样液中不含任何糖类 C. 在脂肪的鉴定实验中，染色后需用体积分数为 50% 的酒精洗去浮色，其原理是苏丹染液易溶于酒精 D. 检测蛋白质时，双缩脲试剂的 A 液和 B 液需等量混合均匀后再加入样液，且需要进行水浴加热

下列关于氨基酸结构与脱水缩合的叙述中，正确的是（ ） A. 组成蛋白质的每种氨基酸分子都只含有一个氨基和一个羧基，且都连接在同一个碳原子上 B. 氨基酸脱水缩合后即可形成有功能的蛋白质 C. 用放射性 $^3\text{H}$ 标记氨基酸中的羧基（$-\text{COOH}$），脱水缩合后水能检测到放射性，而多肽链检测不到放射性 D. 素食主义者容易因某种必需氨基酸不足而出现营养不良症状

某固体混合物可能由 $\rm KNO_3$、$\rm K_2SO_4$、$\rm CuSO_4$、$\rm NaCl$、$\rm FeCl_3$、$\rm CaCl_2$ 和 $\rm Na_2CO_3$ 中的一种或几种组成，依次进行下列四步实验，观察到的现象记录如下。 第一步：向混合物中加水，形成无色透明溶液①； 第二步：向溶液①中滴加 $\rm BaCl_2$ 溶液，有白色沉淀生成，继续滴加 $\rm BaCl_2$ 溶液，直至不再产生沉淀，过滤，得白色沉淀②和滤液③； 第三步：在白色沉淀物②中加入稀盐酸，沉淀全部溶解； 第四步：向滤液③中加入 $\rm AgNO_3$ 溶液，有白色沉淀生成，加入稀硝酸，沉淀不溶解。 根据以上现象判断：混合物中肯定含有______，肯定没有______，不能确定是否含有______。（均填化学式）

如图所示，热气球以 20m/s 的速度匀速竖直上升，到离地 105m 高处，落下一物体。物体落下后，热气球以原来的速度继续匀速上升。($g=10\text{m/s}^2$) (1) 物体从气球上掉下后，经多长时间落回地面？ (2) 物体落下后 6s 时，热气球与物体之间的距离是多少。

已知函数 $y=ax^2+2x-3(a\in\mathbf{R})$ (1) 若 $y>0$ 的解集为 $\{x\mid 2<x<3b\}$，求实数 $a, b$ 的值； (2) 求关于 $x$ 的不等式 $y>(4-a)x-1$ 的解集。

已知二次函数 $y = ax^2 + bx + c$． (1) 若 $y > 0$ 的解集为 $\{x \mid 2 < x < 3\}$，解关于 $x$ 的不等式 $cx^2 + bx + a < 0$； (2) 若 $b = 2$， (i) 证明：“$x = 1$ 是方程 $ax^2 + bx + c = 0$ 的一个实根”的充要条件是：$a + c = -2$； (ii) 若 $a < 2$，且对任意 $x \in \mathbf{R}$，不等式 $y \ge 0$ 恒成立，求 $\frac{a + 4c + 4}{2 - a}$ 的最小值．