[单项选择]The Congress Avenue bridge in the city of Austin, Texas, is home to 1.5 million Mexican freetail bats for a period of six months in the summer, after the bats (62) from their home in Mexico.
A quarter of all mammal species worldwide are bats, and there are 951 species of this strange mammal. The (63) they bring to the world of nature are that they are the important natural (64) of night-flying insects, for example, agricultural pests like the corn ear-worm moth; some bats also eat fish, fruit, frogs and birds. (65) bats are also important elements in rain forest ecosystems (66) they pollinate flowers and (67) seeds for countless trees and shrubs.
Bats include the world’s smallest mammal, the bumblebee bat of Thailand, which weighs only a few grams, (68) the giant flying foxes that live in Indonesia have wingspans of just under two meters.
It is well-known that bats use high-pitched sound
A. opponents
B. enemies
C. competitors
D. rivals

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[单项选择]The Congress Avenue bridge in the city of Austin, Texas, is home to 1.5 million Mexican freetail bats for a period of six months in the summer, after the bats (62) from their home in Mexico.
A quarter of all mammal species worldwide are bats, and there are 951 species of this strange mammal. The (63) they bring to the world of nature are that they are the important natural (64) of night-flying insects, for example, agricultural pests like the corn ear-worm moth; some bats also eat fish, fruit, frogs and birds. (65) bats are also important elements in rain forest ecosystems (66) they pollinate flowers and (67) seeds for countless trees and shrubs.
Bats include the world’s smallest mammal, the bumblebee bat of Thailand, which weighs only a few grams, (68) the giant flying foxes that live in Indonesia have wingspans of just under two meters.
It is well-known that bats use high-pitched sound
A. migrate
B. emigrate
C. transfer
D. mingle

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