问题: People have come to know that silence is a natural ____and must _____ by law.
People have come to know that silence is a natural ____and must _____ by law.
A. source...be provided
B. resource...be protected
C. origin...be prevented
D. substance ...be supplied
解答:
B.人们逐渐认识到科学是一种自然资源，必须由法律来保护。
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