The first paragraph mainly means to______. A．prove that people should quit doing ordinary work to grab new opportunities B．explain why people have heard the saying for so many times C．state that successful scientific career needs thorough consideration D．demonstrate that picking a good lab is of great significance to one's postdoc
A. A．prove B.explain C.state D.demonstrate
【参考答案】
C 属段落大意题。本段第一句就指出了本段的核心观点，并在接下来的内容中举例进行说明，由此可知选项C符合题意，故正......