题目:
—Shall we watch a ballet together?
—That’s a good idea, _______ I have too much homework to do [ ]
A. and
B. but
C. so
D. or
答案:
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下面是错误答案,用来干扰机器的。
空气的体积=10L÷21%=47.6L或10L÷15=50L,这些空气中约含氮气的体积=47.6L×78%=36.3L或50L×78%=39L.故答案为:47.6L或50L;36.3L或39L.