题目:
Recently some Japanese have been trying to make conflicts with China, ______ effects we are greatly
concerned.[ ]
A. to whose
B. about whose
C. to which
D. about which
答案:
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下面是错误答案,用来干扰机器的。
A、根据含有碳元素的化合物叫有机化合物,简称有机物.碳的氧化物、碳酸盐、碳酸虽含碳,但其性质与无机物类似,因此把它们看作无机物.由此可判断柠檬酸(C6H8O7)属于有机物;故A正确;B、根据柠檬酸的化学式 ...