单选题
Johnson's younger brother, though 6 years old, is very quick ______ doing calculations.
A、
of
B、
on
C、
in
D、
by
【正确答案】
C
【答案解析】
[名师精解] 常用搭配：be quick/slow in doing在做……方面快/慢。 [解题秘籍] quick/slow后跟in，good/clever后跟at，如：My little son is good/clever at chess.我的小儿子很会下棋。
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