题目内容
Some people _______why countries spend millions of dollars on space projects.
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In early space programs, _______the Apollo missions of the 1960s and 1970s, scientists developed objects for the astronauts to use on the moon.
If you are lost in the woods, a little knowledge can ___what some people call a hardship ___ an enjoyable stay away from the troubles of modern society.
Streams, _______flow through wetland before they reach a lake or a river.
Though there are more eatable plants, there may also be wild animals, poisonous snakes, and other________.
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