心房与心室及左、右心室的表面分界际志是什么？
参考答案：
心房与心室的表面分界标志的是冠状沟。左、右心室表面的分界标志是前、后室间沟。
While he was investigating ways to improve the telescope, Newton made ______ discover which completely
changed ______ man's understanding of colour. [ ]
A. a…不填
B. a…the
C. 不填…the
D. the…a
欣欣商厦运进120条裙子，6天卖完，平均每天卖多少条？
