托福選擇題試題訓(xùn)練

　　1.The Chisos Mountains in Big Bend National Park in Texas were created by volcanic eruptions that occurred _____。

　　(A)the area in which dinosaurs roamed

　　(B)when dinosaurs roamed the area

　　(C)did dinosaurs roam the area

　　(D)dinosaurs roaming the area。

　　2.In bas-relief sculpture，a design projects very slightly from its background，_____ some coins。

　　(A)as on

　　(B)because

　　(C)the way that

　　(D)similarly。

　　3.Alaska found the first years of its statehood costly because it had to take over the expense of services _____ previously by the federal government。

　　(A)To provide

　　(B)Be provided

　　(C)providing

　　(D)provided。

　　4.With age，the mineral content of human bones decreases，_____ them more fragile。

　　(A)make

　　(B)and to make

　　(C)thereby making

　　(D)which it makes。

　　5.。Not until Kentucky‘s Mammoth Cave had been completely explored in 1972_____。

　　(A)when was its full extent realized(B)that its full extent realized

　　(C)was its full extent realized

　　(D)the realization of its full extent。

　　6.The first explorer _____ California by land was Jedediah Strong Smith，a trapper who crossed the southwestern deserts of the United States in 1826。

　　(A)that he reached(B)reached

　　(C)to reach

　　(D)reaching it

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