1.The radio signals discussed in this passage _____.

1.The radio signals discussed in this passage _____.A. were regularB. were controlled by a clockC. were heard in 1967 onlyD. were secret messages2.The scientists did not tell people about the signals because _____.A. the signals stood for secret messagesB. people might be frightenedC. the signals stood for unimportant messagesD. people would ask them too many questions3.A pulsar _____.A. is a well-known satellite.B. is a small and light star.C. has intelligent beings that were known at that timeD. is a small heavy star sending out strong radio signals4.Which of the following is TRUE?A. The radio signals were sent by a sky body which was known at that time.B. Scientists have searched for pulsars for many years but found none.C. Chinese researchers have discovered six pulsars using FAST.D. Now is the new era of Chinese space discovery with perfect FAST.

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