What does "they" in line 2, paragraph 2 stand for?
A. broadcasts
B. channels
C. spectators
D. technologies
A.insistB.adhereC.continueD.attach
A. insist
B. adhere
C. continue
D. attach
A.limitB.gulfC.riverD.boundary
A. limit
B. gulf
C. river
D. boundary
A.carefulB.carelessC.courteousD.cautious
A. careful
B. careless
C. courteous
D. cautious