單項選擇題This growth,()mainly in Southeast Asia and Africa, has dramatic consequences.

A.happens
B.which is happening
C.which happening
D.which happened


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4.單項選擇題Several languages are likely to die()

A.out
B.down
C.off
D.of

5.單項選擇題Heat causes the()of gas.

A.growth
B.increase
C.expansion
D.extension