正确答案: B

幼鹿经过变态发育过程长出发达的鹿角

题目：下列有关哺乳动物个体发育的叙述，错误的是.

解析：【解析】多细胞生物体内的细胞总是在不断地更新着，总有一部分细胞处于衰老或走向死亡的状态，因此胚胎发育过程中也会有细胞衰老。变态发育指成体与幼体在形态上的差别比较大，而这种形态的改变又是集中在短期内完成的，因此B不正确。细胞分化发生在整个生命进程中，在胚胎时期达到最大程度。原肠胚中胚层的细胞可以发育为皮肤的表皮，感觉器官，神经系统，内胚层发育为呼吸道的上皮、消化道上皮、肝脏及胰腺，其它的基本都是由中胚层发育而来。

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学习资料的答案和解析：

[单选题]Which of the following is true of the Hatches?A .They had their children during the Great Depression.

They gave away their possessions to their neighbors.

[单选题]

brave

[单选题]E.I needed to buy a digital camera, one that was simply good at taking good snaps (快照), maybe occasionally for magazines. Being the cautious type, I fancied a reliable brand. So I went on the net, spent 15 minutes reading product reviews on good websites, wrote down the names of three top recommendations and headed for my nearest big friendly camera store. There in the cupboard was one of the cameras on my list. And it was on special offer. Oh joy, I pointed at it and asked an assistant, “Can I have one of those?” He looked perturbed (不安). “Do you want to try it first?” he said, It didn’t quite sound like a question. “Do I need to?” I replied ,“There is nothing wrong with it？”This made him look a bit insulted and I started to feel bad, “No, no, but you should try it,” he said encouraging ,“compare it with the others.”

compare the camera he had chosen with others.

[单选题]39_____

link

[单选题]Playing on a frozen sports field sounds like a lot of fun. Isn’t it rather risky, ____?

though

解析：解析：本题考查副词辨析。根据句意：在冰场上玩耍听起来很有趣。然会不会有危险呢？ 前后两句之前是明显的转折关系，所以选择though。

[单选题]每个细胞核可以有一到几个核仁。( )

正确

[单选题]金藻门植物细胞具有纤维壁和果胶质壁。( )

正确