2. 外语
  3. (Red and green) light, (if mixing) (in) the right proportion, (will give) us yellow.

(Red and green) light, (if mixing) (in) the right proportion, (will give) us yellow.

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问题 (Red and green) light, (if mixing) (in) the right proportion, (will give) us yellow.
选项 A、Red and green
B、if mixing
C、in
D、will give
答案B
解析
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