Visitors are encouraged by the guide to put their hand in the water; they are astounded at seeing it "glow"*^*strangely in the light, not unlike the .
Question 1:
Visitors are encouraged by the guide to put their hand in the water; they are astounded at seeing it "glow"*^*strangely in the light, not unlike the ....... of a star.
A.development
B.appearanace
C.temperature
D.luminosity
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