Dengue Transmission in the United States Is Increasingly Local

Study the questions and tasks

Work through the material below, or start the interactive practice above to complete an attempt. Try the exercises before opening any answer or transcript sections, then use them to review your work.

Practice level

C1. Try this level if you can follow the instructions and understand most of the language; choose an earlier level if you need more support.

Question formats

Single choice

How to approach this practice

Read the questions, then listen before opening the transcript. Notice names, numbers and any corrections the speaker makes.

1. Question 1 · Single choice

   Choose one answer.

   What earlier sequence does the narration describe?

   Return to the passage, recording or visual
   1. A person was bitten abroad, acquired infection, then returned.
   2. A person returned, developed symptoms, then traveled abroad.
   3. A local mosquito bit a traveler after an infection was diagnosed.
   4. A person acquired infection domestically before traveling abroad.
   Check answers and explanations

   Answer

   A person was bitten abroad, acquired infection, then returned.

   The sequence runs from an overseas bite to infection and return.

   That pattern connected many cases to exposure outside the country: a person could return with an infection acquired elsewhere.

2. Question 2 · Single choice

   Choose one answer.

   When was attention likely to focus on exposure abroad?

   Return to the passage, recording or visual
   1. When infections are associated with travel
   2. When symptoms begin within a community
   3. When local mosquitoes dominate transmission
   4. When a particular location has been identified
   Check answers and explanations

   Answer

   When infections are associated with travel

   Travel-linked cases directed attention toward overseas exposure and returning patients.

   When infections are associated with travel, attention can focus on exposure abroad and on people who return sick.

3. Question 3 · Single choice

   Choose one answer.

   What does the narration clarify about when symptoms appear?

   Return to the passage, recording or visual
   1. Symptom location alone does not establish where infection arose.
   2. Symptoms always begin where a person acquired infection.
   3. The timing of symptoms determines whether transmission is local.
   4. Symptoms are absent in travel-linked infections.
   Check answers and explanations

   Answer

   Symptom location alone does not establish where infection arose.

   The place where symptoms begin does not define transmission’s origin.

   The distinction is epidemiological: it concerns how infections arise and circulate, not simply where a person happens to be when symptoms begin.

4. Question 4 · Single choice

   Choose one answer.

   What must happen for an infection to count as locally transmitted?

   Return to the passage, recording or visual
   1. A person is bitten by an infected mosquito where transmission occurs.
   2. A traveler develops symptoms after returning home.
   3. An infection is diagnosed in a named state.
   4. A mosquito bites someone who has recently traveled.
   Check answers and explanations

   Answer

   A person is bitten by an infected mosquito where transmission occurs.

   The relevant bite occurs where the virus is circulating.

   A locally transmitted infection occurs after a person is bitten by a mosquito carrying the virus in the place where transmission is occurring.

5. Question 5 · Single choice

   Choose one answer.

   What uncertainty does the narration explicitly retain?

   Return to the passage, recording or visual
   1. How large the change has been
   2. Whether local mosquitoes are involved
   3. Whether travel was linked to past cases
   4. Whether dengue transmission occurs in the United States
   Check answers and explanations

   Answer

   How large the change has been

   The scale of the change is not provided.

   The supplied facts establish that this route now accounts for most current transmission, although they do not specify a particular location or quantify the change.

6. Question 6 · Single choice

   Choose one answer.

   Which result does the narration associate with continued local spread?

   Return to the passage, recording or visual
   1. Dengue may become a more persistent domestic concern.
   2. Dengue will cease to be associated with travel.
   3. The change will be measured in every community.
   4. Mosquito transmission will stop outside the United States.
   Check answers and explanations

   Answer

   Dengue may become a more persistent domestic concern.

   Ongoing local spread could make dengue a domestic health challenge.

   If local transmission continues, dengue may be less an occasional consequence of travel and more a persistent domestic health challenge.

7. Question 7 · Single choice

   Choose one answer.

   What does the closing sentence emphasize?

   Return to the passage, recording or visual
   1. The value of distinguishing imported infections from local spread
   2. The need to identify every infected traveler
   3. The certainty that local transmission will persist
   4. The importance of measuring symptoms after travel
   Check answers and explanations

   Answer

   The value of distinguishing imported infections from local spread

   It stresses the significance of distinguishing imported cases from local spread.

   Dengue’s changing transmission pattern underscores the importance of distinguishing imported infections from local spread.

What to review next

Listen again to difficult sections, then open the transcript to check what you heard. Repeat a useful phrase aloud and try the recording once more without the text.

A focused practice result shows how you did on these tasks. Use several activities across skills to decide what to study next; one practice score does not certify an overall CEFR level.

Before you practise: a worked example

Listen for the final information, especially when a speaker corrects or changes an earlier statement.

Example transcript: “Let’s meet at five — actually, half past five would be better.” What is the final suggested time?

The final suggested time is 5:30. Actually signals a correction; the first time is replaced by the later suggestion.

This teaching example is separate from the scored questions. After your test, compare any mistakes with the explanation and revisit the topic before trying again.