Several students have reported the loss of valuables in their dorms. Police are now investigating these serious ____(incidence).
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____(reflect) on my past language learning experiences, I’ve come to realize that practice makes perfect.
Our university enrolls more students than our city’s other two colleges ____(combination).
bicoid蛋白是一类转录因子，它促进胚胎（）发育的差异。
A. 背腹轴
B. 前后轴
C. 背部
D. 腹部
合子基因hunchback的表达受到（）的调节。
A. nanos基因
B. dorsal基因
C. caudal基因
D. pipe基因
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