B. 口语交际。
任务一:根据对话内容填入适当的句子,使对话完整、通顺。
A: Hi, Tom! There's a backpack, a math workbook and a basketball on the classroom floor. 1.
B: No, they aren't mine. Let me check. Oh! 2. His name is written on the cover of the workbook.
A: Right, that's Peter's. But whose black backpack is this? 3.
B: No, it can't be Mike's. He uses a gray backpack and his keychain is on it.
A: Maybe it's Lisa's.
B: 4. Because she mentioned she lost her black backpack this morning.
A: 5.
B: I think it's John's basketball. He's the only one in our class who brings a basketball to school every day.

（符合语境即可，参考示例）
1. Are they yours?
2. The math workbook must be Peter's.
3. Do you think it's Mike's?
4. It must be hers.
5. Then whose basketball is it?

本题为情景对话题，考查口语交际逻辑与表推测的情态动词的运用，需结合上下文问答语境推导合适的句子：
1. 由B的答语“No, they aren't mine.”可推知，此处A是询问这些物品是否属于对方。
2. 由后文“练习册封面上写着他的名字”以及A确认“那是Peter的”可推知，此处是指出这本数学练习册是Peter的。
3. 由B的答语“No, it can't be Mike's.”可推知，此处A是猜测这个背包会不会是Mike的。
4. 由后文B补充的原因“她今早提到自己丢了黑色背包”可推知，此处B赞同A提出的“背包是Lisa的”的猜想。
5. 由B的答语“我认为篮球是John的”可推知，此处A是询问这个篮球的归属。

任务二:朗读下面的句子,按照相关要求完成表格。
| 读音要求 | 按要求完成句子 |
| --- | --- |
| 标注重音(') | It must be hers. |
| 划分意群(//) | Because she mentioned she lost her black backpack this morning. |
| 划分意群(//) | He uses a gray backpack and his keychain is on it. |
| 标注升降调(↗ ↘) | No, it can't be Mike's. |
| 标注升降调(↗ ↘) | But whose black backpack is this? |

1. 标注重音：It 'must be 'hers.
2. 第一句意群划分：Because she mentioned // she lost her black backpack // this morning.
3. 第二句意群划分：He uses a gray backpack // and his keychain is on it.
4. 第一句升降调：No↗, it can't be Mike's↘.
5. 第二句升降调：But whose black backpack is this↘.
（注：意群划分方式不唯一，符合语义停顿逻辑即可）

1. 标注重音规则：英语语句中承载核心信息的实词、表强调的情态动词需要标注重音，本句要突出肯定推测的语气和物品的所属属性，核心重读词为must和hers。
2. 划分意群规则：意群是根据语义、语法结构拆分出的表意相对完整的句子片段，在片段间做停顿不会破坏语义连贯性，按照状语、从句、主句等语义单元合理划分即可。
3. 升降调规则：陈述句句末统一使用降调，句首前置的简短应答词可使用升调；特殊疑问句不属于需要句末升调的一般疑问句范畴，句末使用降调。