This can help to ______ something that the students may not have comprehended.

A．People suffer from various medical and psychological problems today.
B．Businessmen benefit a lot by producing and selling diet products.
C．Physical attractiveness tends to be valued more than anything else in many people’s life.
D．The mass media are always misleadin

A．A period when one misses his home.
B．A period when one feels excited about everything in a foreign culture.
C．A period when one gets acquainted with other people.
D．A period when one begins to study the foreign languag