What might have been discussed in the preceding paragraphs

A．There is only a little water contained in the atmosphere even in a heavy rainstorm.
B．In some dry places there falls an amount of over 400 inches of rain every year.
C．Most water vapor comes from the, oceans all over the world.
D．The process of water returning to the atmosphere is called evaporation.

A．to set the goals that can be easily attained
B．to ask the employee to contribute ideas
C．to praise the employee's success and neglect his weaknesses
D．not to invite the employee to the meeting