单选题 There are many kinds of ants in America. One kind is very strong. People are afraid of it, and animals are afraid of it, too.
These ants move in large groups. They eat all the animals on their way. They can kill and eat elephants, anti they can eat wood houses. Sometimes even people are killed by them. When the ants come near, people leave their homes. But people are sometimes glad after the ants pass, because they can see no insects (昆虫) or snakes.

单选题 The strong ants move ______ .
【正确答案】 B
【答案解析】[解析] 根据第二段第一句These ants move in large groups.可知这种蚂蚁都是大规模地集体行动。所以应选B。
单选题 What do people do when the ants come near?
【正确答案】 C
【答案解析】[解析] 根据第二段第五句When the ants come near,people leave their homes.可知这些蚂蚁到附近后,人们就离开他们的家。所以应选C。
单选题 Why do people sometimes feel happy after the ants pass?
【正确答案】 A
【答案解析】[解析] 根据第二段最后一句But people are sometimes glad after the ants pass,because they can see no insects or snakes.可知人们感到高兴的原因是,这些蚂蚁过去后,人们看不到任何昆虫和蛇了。所以应选A。