A．more audience can afford the time to watch the performance.
B．it doesn't cost much to design costumes for the performers.
C．the settings can be seen more clearly under artificial lighting.
D．distractions may be cut out by the surrounding darkness.
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A．unwanted curtains
B．bath sheets
C．table cloth
D．cloaks
A．At the Threshold of Neutrino Astronomy.
B．Neutrinos and the History of the Universe.
C．The Creation and the Study of Neutrinos.
D．The DUMAND System and How It Works.
A．have been detected for 25 years.
B．possess a variable electric charge.
C．are usually extremely massive.
D．record information about their own origin.