搜题请搜索小程序“爱下问搜题”
问题 选择题

在食物链“a→b→c→d”中，代表消费者的是

A．a

B．d

C．a、b、c

D．b、c、d

答案

答案：D

考点：

分析：解答此题的关键有二点，一个是明确食物链的概念：生产者与消费者之间这种吃与被吃的关系；另一个是知道食物链的正确写法．

解答：解：食物链反映的是生产者与消费者之间吃与被吃这种关系的，所以食物链中不应该出现分解者和非生物部分．食物链的正确写法是：生产者→初级消费者→次级消费者…注意起始点是生产者．因此在食物链“a→b→c→d”中，a是生产者，代表消费者的是b、c、d．

故选D

点评：解答此类题目的关键是知道食物链的写法即生产者→消费者．

单项选择题

目标营销的基础是（）。

A.市场细分

B.营销环境

C.营销组合

D.营销计划
查看答案
阅读理解

The clock struck eleven at night. The whole house was quiet. Everyone was in bed except me. Under the strong light，I looked sadly before me at a huge pile of that troublesome stuff（东西） they call “books”.

I was going to have my examination the next day.  “When can I go to bed？” I asked myself. I didn’t answer，in fact, I dared not.

The clock struck twelve. “ Oh，dear！” I cried. “Ten more books to read before I can go to bed！” We pupils are the most wretched creatures in the world. Dad does not agree with me on this. He did not have to work so hard when he was a boy.

The clock struck one. I was quite desperate（绝望的）now. I forgot all I had learned. I was too tired to go on. I did the only thing I could. I prayed，“Oh，God，please help me pass the exam tomorrow. I do promise to work hard afterwards，Amen.” My eyes were so heavy that I could hardly open them. A few minutes later，with my head on the desk，I fell asleep.

小题1: When the author was going over his lessons，all the others in the house were  ________ .

A．asleep

B．outside

C．working in bed

D．quietly laughing at him小题2: The underlined word wretched in Paragraph 3 probably means _______ .

A．very happy

B．disappointed

C．very unhappy

D．hopeful小题3: Reviewing his lessons didn’t help him because _______  .

A．he was excited

B．he was nervous

C．he was worried

D．he hadn’t studied hard before the examination小题4: The best title for the passage would be __________ .

A．The Night Before the Examination

B．Working Far into the Night

C．A Slow Student

D．Going Over My Lessons
查看答案