听力原文： Lions are opportunists. They prefer to eat without having to do much work. When resting in the shade, they are also watching the sky to see what is flying by, and even in the heat of the day they will suddenly start up and run a mile across the plains to find out what is going on. If another animal has made a kill, they will drive it off and take the kill for themselves. A grown lion can easily eat 60 pounds of meat at a single feeding. Often they eat until it seems painful for them to lie down.
The lionesses (the females), being thinner and faster, are better hunters than the males. But the males don't mind. After the kill they move in and take the best share.
Most kills are made at night or just before daybreak. We have seen many, many daylight attempts but only ten kills. Roughly, it's about twenty daytime attempts for one kill.
When lions are hiding for an attack by a water hole, they wait patiently and can charge at any second. The kill is the exciting moment in the day-to-day life of the lion, since these great animals spend most of their time, about 20 hours a day, sleeping and resting.
Lions are social cats, and when they are having a rest, they love to touch each other. After drinking at a water hole, a lioness rests her head on another's back. When walking, young lions often touch faces with older ones, an act of close ties among members of the group.
Questions 29 to 32 are based on the passage you have just heard.
29. Why are lions described as opportunists？
30. What do we learn from the passage？
31. How can we know that lions are social animals？
32. What would be the best title for the passage？
(33)

A. They are cruel animals.
B. They are clever animals.
C. They like to take every chance to eat.
D. They like to take advantage of other animals.