检查发现的一个微弱显示，在第二天再观察时发现该显示已消失，其

搜题请搜索小程序“爱下问搜题”

问题单项选择题

检查发现的一个微弱显示，在第二天再观察时发现该显示已消失，其可能原因是（）

A、前一天发现的显示其实不存在

B、该微弱显示在已干燥的显像剂中因时间过长过度弥散而消失

C、该显示为错误显示

D、以上都不对

答案

参考答案：B

阅读理解

阅读理解。

Mr Jones goes to see his friends in New York. His friends work(工作) in an art club. Mr Jones

doesn't know New York very well. And he can't find the way(路). He sees a girl at a bus stop. He

walks to the girl and asks, " Excuse me, can you tell me the way to Center Street?"

The girl is friendly. She smiles(微笑) but she can't speak English. She can speak French. She is

new here, too. She takes out a small notebook from her pocket and reads something on it, "I am

sorry,sir. I can't speak English. "

根据文章，判断句子对错。

( )1. Mr Jones goes to New York to see the girl.

( )2. Mr Jones's friends work in an art club.

( )3. Mr Jones can't find his way in New York because he is very old.

( )4. The girl gives the notebook to Mr Jones.

( )5. The girl can't speak English.

实验题

下面是人体上肢的两种运动状态图，请分析并回答下列问题：（10分）

（1）图中①和②表示了一块骨骼肌的组成，①和②分别是__________、__________。A的名称是___________。

（2）图甲表示___________运动状态，要完成该动作，A必须是___________状态，而B则是___________。图乙中人体上肢的运动状态需要___________的收缩才能完成。

（3）通过分析看出，骨的运动是靠骨骼肌的___________牵拉完成。因此与骨相连的肌肉总是由___________组肌肉相互配合，并且受到___________的控制和调节以及其他如消化、呼吸、循环系统的协作。