单项选择题

对于一个隔离的且数量已经大为减少的种样来说，其潜在的危险是（）

A.丧失了遗传的多样性 B.基因流动减少 C.适应环境的能力降低 D.变异频率降低

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单项选择题

明清时期，帝王陵神道发展到了高峰，如明十三陵的神道全长（）。
A、5公里
B、6公里
C、7公里
D、8公里

单项选择题

Who are they?

A、They are cartoon characters called “entrepreneurial babies”.
Analysis: there is an introduction at the end of the video. It is mainly used to urge students to complete the whole course, and also used to introduce the special emoji of this course designed by the course designer.
B、Couples who are not friendly to the singles.
C、Cyberstars of innovation and Entrepreneurship.
D、Innovative products designed by entrepreneurs.