题干

如图为细胞间信息传递的同种模式示意图,据图描述正确的是  

A:若细胞1产生激素是胰高血糖素,则靶细胞主要是肝 细胞和肌细胞

B:兴奋只能由细胞2传递到细胞3,不能反向传递

C:若细胞2可分泌促性腺激素释放激素,其作用的靶细 胞是性腺细胞

D:细胞3受到刺激产生兴奋时,兴奋部位膜内负电位变为正电位

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答案(点此获取答案解析)

D

同类题3

先通读下文,根据短文内容完成表格中所缺信息,每空限填一词。

    What do you read when you are travelling by train or bus? What are other people reading? Perhaps a woman sitting near you is reading a love story. A man is reading a serious biography(自传) about a president. And there's a student reading an English textbook.

    What do their choices(选择) say about them? Do you think you can know them by what they are reading? I have got to tell you that your feelings of them may be quite wrong. The woman reading the love story could be a lawyer. She just wants a light read to take her mind off work. The man reading the biography wants you to think that he is very clever. The student reading the textbook isn't a student at all. She's an English teacher.

    Publishers(出版商) know that some people care what they read on trains or buses and so they put out different types of covers. For example, books about Harry Potter have a cartoon cover for young readers and then another more serious cover for grown—ups.

    So next time you are on a train, look around and see what other people are reading, but don't jump to any conclusions(结论). You will be wrong maybe.

Here is a sentence that you could say, “Don't judge(判断) a book by its cover”.

Title:Never judge a book people choose to read by the cover.

Persons

The lawyer reading a love story just wants to have a ____.

The man reading the biography wants____people to think he is very clever.

The student reading a textbook in fact____English.

Ways

Publishers won't put out the____cover of a book.

Conclusion

If you jump to the conclusions carelessly, you may make ____.