giúp em vs  ạ 
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* Questions:
Question 6: Which of the options below is the best title (chủ đề) for the passage?
A. Limiting Factors in Population Growth.
B. A brief History of Population and Over-population.
C. Thomas Malthus's Theory.
D. The United Nation's Estimate.
Question 7: What is the population from the estimates based on research by the US?
A. 5 billion
B. over 6 billion
C. 2 billion
D. 7 billion
Question 8: Who was Thomas Malthus?
A. An economist
C. A doctor of medicine
B. A United Nation's representative
D. A scientist
Question 9: According to the passage, the limiting factors in population growth have be
lessened because of........
B. scarcity
D. improved technology
A. disasters
C. precaution
Circle the words whose underlined part is pronounced differently from 3 other V
from question 10 to 15
heat