问题 选择题

当你发现显微镜镜头不洁时,除去污物的方法是(   )

A.用纱布擦

B.用手擦

C.用擦镜纸擦

D.不用拭去

答案

答案:C

题目分析:清洁镜身时应有纱布,清洁物镜和目镜的镜头时,应用擦镜纸,擦镜纸质软又不易掉毛,用擦镜纸擦拭镜头既可以清洁镜头,又可以避免损伤镜头和有少量的纤维留在镜头上,影响观察效果。

点评:此题是一道实验操作题,具体考查的是对显微镜的清洁方法,记清对显微镜的清洁方法。

阅读理解

阅读理解。

       It all started with an Indian, meal and ended in hospital.

       For many people the subject(主题)of hiccups is a joke, but for Harry Mendes, a fif-teen-year-old

schoolboy from Birmingham , it was something quite different.

       His hiccups began one Sunday lunchtime and continued(继续)day and night for two weeks. After the first week , Harry's parents took him to hospital, but it took another week for the doctors to cure(治愈)his attack(发作). 

       Harry described(描述)what happened to him. 

       "When I began to hiccup,I drank a glass of water. but that didn't do any good. That evening I had

hiccups every four seconds(秒). We tried everything to stop them. I held my breath and drank cold drinks. My father even tried to give me, a shock but that didn't work , either. "

      After a week of sleepless(无眠的)nights,he went to hospital. The doctors took an X-ray(射线)of

his chest but they couldn't find anything wrong. 

       "They gave me some medicine and my hiccups slowed down,but it was another week before the me

dicine worked completely(完全地)and my hiccups stopped. "

        Harry was very lucky, The world record holder is the American farmer Charles Smith , who

hiccupped for sixty-eight years. He stopped in 1990 at last, but nobody knows why.

1.Harry,s hiccups lasted(持续)           .

A. a week            

B. fourteen days

C. twenty-eight days    

D. one month

2.His hiccups started after he         .

A. went to hospital      

B. drank a glass of water

C. finished his homework  

D. ate an Indian meal

3.His parents decided to take him to hospital when he         .

A. couldn't stop hiccupping      

B. hiccupped at night

C. held his breath              

D. hiccupped for four seconds

4.His hiccups completely stopped one week after the doctor         .

A. let him drink cold drinks    

B. gave him a shock

C. took an X-ray of -his chest  

D. gave him some medicine

5.What does the underlined word"shock"in this passage mean?

A. 哈欠        

B. 休克

C. 喷嚏          

D. 震惊

单项选择题