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【单选题】
What is a kite runner?A.
Someone who competes in the kite-fighting tournament
B.
Someone who makes and sells kites
C.
Someone who retrieves the losing kite of a kite battle
D.
Someone who is exceptionally skilled at flying kites
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【单选题】A peck is 1=4 of a bushel. If the price elasticity of demand for bran is -0.2 when bran is measured in bushels, then when bran is measured in pecks, the price elasticity of demand for bran will be:
A.
-0.05.
B.
-0.8.
C.
-0.1
D.
None of the above.
【简答题】地磁三要素：（）是磁子午线与地理子午线的夹角、（）是磁针从赤道向高纬度移动时与水平面的夹角、（）是地磁场内磁力的大小。
【简答题】地磁子午线与地理子午线之间的夹角叫（ ）。