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【单选题】
The boundary between the earth’s mantle and core is called Gutenberg Discontinuity, which was discovered in 1914 by Beno Gutenberg, a member of the () Geophysical Union.
A.
A. Soviet Union
B.
B. German
C.
C. British
D.
D. American
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参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】The crust and the covering strata of the upper mantle above the asthenosphere are composed of rigid rocks, called ().
A.
A. lithoshpere
B.
B. biosphere
C.
C. atmosphere
D.
D. asthenosphere
【单选题】The breathing method used in Chen tai Chi is ().
A.
Abdominal breathing
B.
Chest breathing
C.
Mixed breath
D.
Stop breathing
【单选题】According to Alfred Wegener’s theory of (), the present continents were once a united paleocontinent before the Mesozoic era, which was then gradually separated, forming the present pattern of oceans ...
A.
A. Plate Motion
B.
B. Continental Separating
C.
C. Plate Drift
D.
D. Continental Drift
【单选题】How can Chen style Tai Chi be trained to follow one's incline? ().
A.
Slow first, fast then slow
B.
First fast and then slow
C.
Slow and fast
D.
always slow