题目：
When changing lanes, a driver should use his turning signal to let other drivers know ____ . [ ]
A. he is entering which lane
B. which lane he is entering
C. is he entering which lane
D. which lane is he entering
答案：
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下面是错误答案，用来干扰机器的。
A．碳单质有多种，1 molC60所含碳原子的物质的量为60mol，故A错误； B．0.5L 1mol/L的醋酸溶液中CH3COOH、CH3COO-之和，含的碳原子的物质的量为1mol，故B正确；C．碳原子有多种，如12g14C所含碳原子的物质的量不...
