原题
Radio Astronomy: A New Perspective
Radio astronomy is the study of celestial objects using radio waves rather than visible light. Unlike optical telescopes, radio telescopes can detect signals from sources obscured by dust or too faint to be seen with traditional instruments. This branch of astronomy has led to transformative discoveries, including the detection of cosmic microwave background radiation—a faint glow left over from the Big Bang—which has enabled scientists to reconstruct the universe's early conditions.
One of the most famous radio astronomy discoveries was the identification of pulsars in 1967. These rapidly spinning neutron stars, the dense remnants of massive stars that have exploded, emit beams of radio waves at regular intervals. Observing pulsars helps scientists understand the end stages of stellar life and the behavior of matter under extreme conditions.
However, radio astronomy faces growing challenges due to technological interference. Devices like mobile phones, wireless routers, and satellites emit radio frequencies that can overwhelm the faint cosmic signals astronomers seek to detect. This "radio frequency pollution" makes it increasingly difficult to isolate genuine astronomical data. To combat this, observatories are often located in remote areas and protected by radio quiet zones, but the global spread of wireless technology continues to pose a serious threat.
Why does the author mention "the global spread of wireless technology?
ATo suggest that the issue of technological interference is not likely to end soon
BTo argue that technological interference is not as severe as was once thought
CTo support the argument that optical telescopes are more reliable than radio telescopes
DTo highlight the sophisticated tools astronomers use to detect cosmic signals
正确答案：A
解题思路
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