正确答案: A

蛋白质

题目：决定受精亲和或不亲和的物质是花粉壁和柱头表面的( )。

解析：A

查看原题

举一反三的答案和解析：

[单选题]阅读下列短文，从每题所给的A、B、C、D四个选项中，选出最佳选项，回答41－45题。 I am a writer. I spend a great deal of my time thinking about the power of language—the way it can evoke(唤起) an emotion, a visual image, a complex idea, or a simple truth. Language is the tool of my trade. And I use them all—all the Englishes I grew up with.Born into a Chinese family that had recently arrived in California, I’ve been giving more thought to the kind of English my mother speaks. Like others, I have described it to people as “broken” English. But feel embarrassed to say that. It has always bothered me that I can think of no way to describe it other than “broken”, as if it were damaged and needed to be fixed, as if it lacked a certain wholeness. I’ve heard other terms used, “limited English,” for example. But they seem just as bad, as if everything is limited, including people’s perceptions(认识)of the limited English speaker.

she is a writer by profession

[多选题]黏菌是介于动物和真菌之间的真核生物，生活史中一个时期具动物性，另一个时期具植物性。具动物性特征的是( )。

无细胞壁

无叶绿素

营养体形态、结构、行动和取食方法与变形虫相同

解析：ACE

[单选题]—— Do you mind my opening the window? It’s a bit hot in here.——____________ , as a matter of fact

Yes, I do