Throughout the world, there are about one thousand kinds of bats (蝙蝠), which are usually divided into two groups: Megachiroptere and Mricochiroptera. Their body lengths vary (变化) rather widely from 1.5 inches to 16.7 inches.
Bats are the only little mammal (哺乳动物) that can actually fly in the world, and it is safe to say they are very good at this skill using echolocation (回声定位) to find their way in the sky. Using echolocation bats are able to take sound waves to create a detailed map of the area around them.
Bats use the ability not only to know what may be in their way but also to hunt for food. Bats are active during the night, and they use nighttime to look for food. In fact, they can eat so many bugs (小虫) in one night as to make them flightless for a period of time. Bats not only eat bugs, but also feed on fruit and small birds. Many places have brought in bats to help as a choice instead of using pesticides (杀虫剂).
Anyone can build or buy a bat house to put up in the backyard. Building a bat house is easy and just a little care is needed to keep it. It could help deal with bugs each year. Bats stay together in these bat houses along with inside houses, buildings, trees and other places, and usually stay together in large numbers.
As you can see, bats are far from the scaring creatures. So, next time you see them, stop and think of the bugs and flies you will miss.
12. According to the passage, bats can’t fly for a period of time when they are ________.
A.too full | B.too tired | C.very hungry | D.very sleepy |
13. Which of the following statements about bats is NOT mentioned in the passage?
A.Living habits | B.Physical features. | C.Diet. | D.Growth. |
14. What does the writer think of bats?
A.Scaring. | B.Clever. | C.Helpful. | D.Strange. |
15. We can infer from the passage that ________.
A.bats have sharp eyes at night |
B.many people may be afraid of bats |
C.a bat house in the backyard needs no care |
D.bats send out sound waves to find their way |