4. According to the passage， one advantage that neutrinos have for studies in astronomy is that they
（A） have been detected for the last twenty-five years
（B） possess a variable electric charge
（C） are usually extremely massive
（D） carry information about their history with them
（E） are very similar to other electromagnetic particles
5. According to the passage， the primary use of the apparatus mentioned in lines 24-32 would be to
（A） increase the mass of a neutrino
（B） interpret the information neutrinos carry with them
（C） study the internal structure of a neutrino
（D） see neutrinos in distant regions of space
（E） detect the presence of cosmic neutrinos
6. The passage states that interactions between neutrinos and other matter are
（A） rare
（B） artificial
（C） undetectable
（D） unpredictable
（E） hazardous