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【单选题】
An American botanist Joseph Rock published pictures of Lijiang in the famous magzine______ in the 1920s.
A.
National Geology
B.
National Geography
C.
National Biology
D.
National Economy
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参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】Sun beams coming through windows are____
A.
thermal energy
B.
mechanical energy
C.
chemical energy
D.
electrical energy
【单选题】Whose heating factor is the highest?()
A.
Brown coal
B.
Wood
C.
Fat coal
D.
Lead accumulator
【单选题】To figure out how many percent of an energy input may be transformed into end energy in a period, we can use____
A.
energy density
B.
degree of utilization
C.
energy efficiency
D.
overall energy consumption