2. 考研
  3. Earth has an atmosphere, which protects the surface from harmful rays.

Earth has an atmosphere, which protects the surface from harmful rays.

admin2015-11-11  10
问题 Earth has an atmosphere, which protects the surface from harmful rays.
选项 A、minerals
B、substances
C、gases
D、beams
答案D
解析 ray的意思是“光线”。minerals“矿物质”，substances“物质”，gases“气体”，beams“光束”。根据题意，本题答案为D。
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