What did scientists learn about earthquakes at the Rocky Mountain Arsenal?A) They occur at about 4,000 metres below ground level.B) The injection of water into earthquake faults prevents earthquakes from occurring.C) They are usually caused by the oil in

题目

What did scientists learn about earthquakes at the Rocky Mountain Arsenal?

A) They occur at about 4,000 metres below ground level.

B) The injection of water into earthquake faults prevents earthquakes from occurring.

C) They are usually caused by the oil in the faults.

D) Harmful earthquakes earl be possibly prevented by causing small, harmless earthquakes.

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更多“What did scientists learn about earthquakes at the Rocky Mountain Arsenal?A) They occu ”相关问题

  • 第1题：

    What ________ the notice________?

    A. is, say

    B. is, said

    C. did, say

    D. does, say


    参考答案：D

  • 第2题：

    What _______ the police looking for?

    A. is

    B. are

    C. will

    D. did


    正确答案：B

  • 第3题：

    What( )wrong with you

    A.is

    B.are

    C.have

    D.did


    正确答案：A

  • 第4题：

    – What’s the temperature today –( ) .

    A.Nice and cool

    B.The weather forecast says it’s fine

    C.About 18 degrees

    D. Sure, it’s sunny


    参考答案:C

  • 第5题：

    A:What’s the extent of the delay? B: ( )

    A.BeiJing

    B.apron

    C.About 2 hours

    D.bullet


    正确答案：C

  • 第6题：

    You look（） What（）you（）?

    Atire；did；do

    Btiring；have；done

    Ctired；do；do

    Dtired；have；been doing


    D
    略

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