Meaning: 'Dynasties' refers to a series of rulers from the same family or lineage, particularly in the context of historical governance.

Wrong options:

• families: While 'families' could refer to the emperor's relatives, it lacks the broader historical context of ruling powers, making it less suitable here.
• society: 'Society' refers to a community of people, which does not specifically relate to the ruling powers or governance, thus not fitting the context.
• country: 'Country' refers to a nation as a whole, which is too broad and does not specifically denote the ruling lineage that the emperors were protecting.

Correct answer: disconnected

Explanation: The word 'disconnected' accurately describes the nature of the wall as not being a continuous structure. It fits grammatically as an adjective that modifies 'barricades,' indicating that the segments of the wall were not joined together, which is consistent with the context provided.

Meaning: 'Disconnected' means not joined or linked, indicating that the barricades were separate from each other.

Wrong options:

• divided: 'Divided' implies a separation but does not convey the lack of connection as effectively as 'disconnected.'
• joined: 'Joined' suggests that the barricades are connected, which contradicts the description of the wall in the text.
• made: 'Made' does not fit grammatically as it does not describe the state of the barricades; it is a verb rather than an adjective.

Correct answer: strong

Explanation: The adjective 'strong' is appropriate here as it describes the desired quality of the wall that the First Emperor wanted. It fits grammatically and contextually, emphasizing the need for a robust structure to withstand invasions, aligning with the historical context of defense.

Meaning: 'Strong' means having the power to withstand force or pressure, indicating the wall's intended durability.

Wrong options:

• ideal: 'Ideal' suggests perfection but does not convey the necessary strength required for a defensive structure, making it less suitable.
• sound: 'Sound' implies reliability but is less direct in conveying the physical strength needed for a wall compared to 'strong.'
• perfect: 'Perfect' implies flawlessness, which is not the primary concern in the context of building a wall for protection.

Correct answer: slave

Explanation: The term 'slave' fits grammatically as a noun that describes the type of labor being performed. It is contextually relevant, indicating that the laborers were forced to work without compensation, which aligns with the historical practices during the Qin Dynasty.

Meaning: 'Slave' refers to a person who is owned by another and forced to work without pay, highlighting the harsh conditions faced by the laborers.

Wrong options:

• captive: 'Captive' refers to someone who is captured but does not specifically denote forced labor without compensation, making it less precise.
• victim: 'Victim' implies someone harmed or injured, which does not accurately describe the nature of the labor being performed in this context.
• servant: 'Servant' suggests a person who serves others, often with some level of compensation or agreement, which does not fit the context of forced labor.

Correct answer: fever

Explanation: The word 'fever' fits grammatically as a noun that describes a common illness. It is contextually relevant, indicating a specific health issue that could arise from the harsh working conditions, aligning with the historical context of laborers suffering during construction.

Meaning: 'Fever' refers to an elevated body temperature often associated with illness, indicating the health risks faced by the laborers.

Wrong options:

• disease: 'Disease' is a broader term that encompasses various health conditions, but it does not specify the commonality of fever in this context.
• virus: 'Virus' refers to a specific type of pathogen and is too technical for the context, which is discussing general health issues.
• epidemic: 'Epidemic' refers to a widespread occurrence of a disease, which is not the specific issue being highlighted in the context of individual laborers' health.