完成句子-根据句意补全句子 适中0.65 引用2 组卷40
(2022·河南新乡·二模)Her name was Laika.She was a good dog. Her 1957 flight paved the way for space exploration when scientists wondered ________ it was lethal (致命的) for living things. (用适当的词填空)
2022高三·全国·专题练习
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