上皮组织一面向着外界或腔隙，一面借基膜与结缔组织相连，故上皮细胞具有极性。()
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What does the man ask the woman to do？
A. Host the party.
B. Prepare for the party.
C. Remind him of the party.
D. Go with him to the party.
有丝分裂前期的特点之一是核膜、核仁尚未发生变化，而染色体逐渐向细胞中央移动。()
透明软骨的特点是基质内含有大量成束的胶原纤维。()
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