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Explore TOEFL iBT DrillsAceThePrepTrap ForensicsTOEFL iBTHub →
TOEFL iBTReadingInsert Text
Level 3 Trap Drill
Can you avoid the examiner's trap?Select an option to evaluate
Look at the four squares [■] that indicate where the following sentence could be added to the passage:
'Without this gravitational containment, planetary atmospheres would bleed into interplanetary space.'
Where would the sentence best fit?
'[■ A] A planet's ability to retain an atmospheric envelope depends upon the balance between thermal gas velocity and gravitational escape velocity. [■ B] Gas molecules in an atmosphere possess kinetic energy proportional to ambient temperature. [■ C] If a planet has sufficient mass, its gravitational field exerts an attraction strong enough to exceed the root-mean-square speed of atmospheric molecules. [■ D] For example, Mars has only one-tenth the mass of Earth, which is why it was unable to prevent the vast majority of its ancient atmosphere from escaping into space.'
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