In this section, you will hear several passages.
Listen to the passages carefully and then answer the questions that
follow.
Questions 11 to 13 are based on the
following passage. At the end of the passage, you will be given 15 seconds to
answer the questions. Now, listen to the
passage.
In this passage, what does the term "coalescence" refer to
A．The gathering. of small clouds to form large, clouds. B．The growth of droplets from small to big. C．The fall of raindrops and other precipitation D．The movement of dust particles in the sunlight.