单项选择题

Programs displayed on HDTV

A．give super-sharp digital pictures.
B．may be sent out at 1080 lines of resolution.
C．need input of more efforts.
D．will have a bright future.
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单项选择题
Who does the author intend to write the passage for
A．TV buyers.
B．TV broadcasters.
C．TV manufacturers.
D．government officials regulating TV broadcasts.
单项选择题
Human greenhouse gas emissions which cause low-lying places to disappear are mainly let out by
A．forest fires.
B．the industrialized nations.
C．people themselves in low-lying islands.
D．the developing countries.
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