单项选择题

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

A．Red and green
B．if mixing
C．in
D．will give
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(What) he does, he always does (it) well, (though) he has (some difficulties).
A．What
B．it
C．though
D．some difficulties
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Many people (live in) Tokyo think that (life) in a large city (offers) special (advantages).
A．live in
B．life
C．offers
D．advantages
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