【单选题】Nell Hunt' s design would finally lead to the improvement of the way of
A．recording direct sunshine
B．recording the hours of sunshine
C．using the energy of the sun
D．knowing how strong sunlight is
【单选题】Nell Hunt' s design would finally lead to the improvement of the way of
A．recording direct sunshine
B．recording the hours of sunshine
C．using the energy of the sun
D．knowing how strong sunlight is
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