9

Set 5: Central Ideas

Explanation

Answer: C

PASSAGE

The following text is about clouds. Clouds form when water vapor in the air cools and condenses into tiny water droplets or ice crystals. They play a crucial role in Earth's climate system by reflecting sunlight back into space and by trapping heat near the surface. Additionally, clouds are the primary source of precipitation, delivering the fresh water needed for life on land.

According to the text, how do clouds influence Earth's climate?

A. By constantly generating heat from within
B. By reflecting sunlight and trapping heat
C. By blocking all sunlight from reaching the ground✓ Correct
D. By absorbing all the water from the oceans

Detailed Explanation

Choice B is correct. The text mentions two roles: 'reflecting sunlight back into space' and 'trapping heat near the surface.'

Key Evidence:

• "reflecting sunlight back into space"

• "trapping heat near the surface"

Why others are wrong: A (Inaccurate), C (Too extreme (reflects some, not all)), D (Inaccurate).

← PreviousNext →