问题 填空题 案例分析题

甲图是细胞间信息传递的三种模式示意图,乙图为突触的模式图。

C模式中神经元之间的联系可用乙图表示,在该结构中,信息的传递是()的(双向或单向),因为⑤()中的信息物质只能由突触前膜传递到突触后膜,即由前一个神经元的()释放,作用于后一个神经元的()的膜。

答案

参考答案:单向;突触小泡;突触前膜(或轴突末梢);细胞体或树突

解析:

乙图表示突触结构,⑤是突触小体。因突触小体中的神经递质只能由前神经元的突触前膜释放,作用于后神经元的细胞体膜或树突膜,故突触间信息传递是单向的。 考点:本题考查激素分泌的分级调节、水盐平衡调节、体温调节及突触间信息传递等知识,意在考查考生识图能力和理论联系实际,综合运用所学知识解决社会生活中相关生物学问题的能力。

阅读理解

Top student Lin Yijian had a problem recently. The 14-year-old boy from Xiamen used to get marks of over 110 points (out of 120 possible points) on his math tests. But during last semester's final exams, his math score was only 90 points.

It was a shock. "I didn't know what happened," said Lin, who kept feeling nervous and frustrated about math during the following month.

Like Lin, many of us have setbacks (挫折) in life. What would you do to deal with these setbacks? Would you just let them be and give up?

Lin chose to face his problem. His parents and teacher also gave him help. After some hard work he now gets marks between 100 and110 points on his math tests. Although he still isn't at his original (原来的) level, Lin doesn't panic anymore.

"Don't be scared by setbacks," he said. "You will beat it."

Chen Xingzhu in Shenzhen also has a story to tell. The 15-year-old girl is not good at doing sit-ups (仰卧起坐), which is necessary for the coming high school PE entrance exam. One has to do at least 35 sit-ups in a minute to pass the test. Most of Chen's classmates can do 40. However, Chen could only do 20.

Feeling worried, Chen decided to do something. She did sit-ups for half an hour every day after school. Now, after a month, she can do 30 sit-ups a minute.

"I finally found what made me slow through continuous practice and then improved little by little," said Chen. "I believe next month I will be able to do 40!"

小题1: What problem did Lin Yijian have recently?

A.He used to get high marks.

B.He did well in math.

C.He did not so well as before in math.

D.He had no time to study math.小题2:According to the passage, which is NOT true among the following statements?

A.Lin chose to face his problems.

B.His parents and teachers also helped him.

C.After some hard work, he now gets marks over 110 points.

D.Lin faced his problems instead of giving up.小题3:What problems does Chen Xingzhu have according to the passage?

A.He is also not good at math.

B.He is also not good at PE.

C.He is also not good at sit-ups.

D.He is also not good at PE entrance exam.

多项选择题