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A．has become
B．have become
C．became
D．had become
答案
更多“Dung beetles ______ an integral part of the successful management of diary farms in Austra”相關(guān)的問題
第2題
A．Y
B．N
C．NG
第3題
Why do researchers estimate elephant numbers in an area by counting dung piles？
A．Because elephants are difficult to catch
B．Because it is not possible to count elephants from a plane．
C．Because it is not possible to keep track of elephants．
D．Because elephants are shy animals
第4題
A they are different in size
B they scatter an over the region．
C they are different in decay rate．
D they are different in quality．
第5題
Why did the farmers become desperate in the mid 30s？
A．Their houses were destroyed by cane beetles.
B．Cane beetles dropped their eggs onto the ground around the base of the plant.
C．Cane beetles killed all their livelihood.
D．Their sugar cane plants were ruined by overwhelming beetles.
第7題
The grass minerals in the Indian dung fossils are of oldest minerals on record,
A．Y
B．N
C．NG
第8題
A．Y
B．N
C．NG
第9題
Why do researchers estimate elephant numbers in an area by counting dung piles？
A．Because elephants are difficult to catch.
B．Because it is not possible to count elephants from a plane.
C．Because it is not possible to keep track of elephants.
D．Because elephants are shy animals.
第10題
