43. According to the article, who were Belka and Strelka?
(A) they were the American president's pet dogs
(B) they were two Soviet men launched into space
(C) they were American-trained chimpanzees
(D) they were the first animals to return to Earth alive after a journey into space
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統計: A(1), B(0), C(0), D(5), E(0) #2717643
統計: A(1), B(0), C(0), D(5), E(0) #2717643