正确答案: A

正确

题目：染色质和染色体是同一物质不同阶段所表现出来的不同形态。( )

解析：A

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举一反三的答案和解析：

[单选题]The research mentioned in the last paragraph reports that

people with dogs did more exercise

[单选题]Up to now, the program ________ thousands of children who would otherwise have died.

has saved

解析：本题考查动词时态的用法。句意应为“截止到现在，这个项目已经挽救了成千上万的本来会死去的孩子的生命。”up to now是现在完成时态的标志，所以空格处使用现在完成时态。

[单选题]裸子植物的小孢子叶又可称( )。

雄蕊

[单选题]眼子菜属(如菹草)叶内的通气组织发达。( )

正确

[单选题]某蛋白质由m条肽链、n个氨基酸组成。该蛋白质至少有氧原子的个数是

n-m n-2m n+m n+2m

解析：

由氨基酸的结构通式可知一个氨基酸至少有两个O，形成蛋白质缩合过程中要脱掉水，2n-(n-m)=n+m。

[单选题]糊粉粒贮藏的养分是( )。

蛋白质

[单选题]回答 68 ~ 70 题：It is true that good writers rewrite and rewrite and then rewrite some more .But in order to work up the desire to rewrite ,it is important to learn to like what you write at the early stage.I am surprised at the number of famouw writers I know who say that they so dislike reading their own writing later that they even hate to look over the publishers’ opinions .One reason we may dislike reading our own work is that we’re often disappointed that the rich ideas in our minds seem very thin and plain whern first written down .Jerry Fodor and Steven Pinker suggest that this fact may be a result of how our minds work..

Many of them hate reading their own works

[单选题]下列细胞中属配子的是( )。

精子