问题 单项选择题 A1/A2型题

在0.4%NaCl溶液中红细胞的形态变化是()

A.红细胞叠连

B.红细胞皱缩

C.红细胞沉降速率加快

D.溶血现象

E.无明显变化

答案

参考答案:D

解析:本题要点是红细胞的渗透脆性。渗透脆性指在低渗盐溶液中发生膨胀破裂的特性。红细胞在等渗的0.85%NaCl溶液中可保持其正常形态和大小。

完形填空

In many classrooms, it’s not  31 to find students spinning (旋转) their pens 32they listen to their teachers.

Pen-spinning is also popular  33  Japanese students. It is a form of entertainment. Recently, a pen-spinning competition was held in Tokyo, Japan. Ryuki Omura, a 16-year-old high school student, became the first pen-spinning   34 .

276 people took part in the competition. The came from different age groups. Some were students   35  some were office workers. First, they   36  the videos of their pen-spinning skills to the organizer’s website. Then some of them came to the last round in Tokyo. 37  of them had 30 seconds to show their skills in front of 400 people,   38 reporters and fans. Omura took a pen from his little finger to the rest fingers, then to his palm(手掌) and the back of his hand. His wonderful show made him   39  the champion.

Omura said he began learning pen-spinning only about 14 months ago. He did  40 in the competition. If you like to spin your pen, you can practice it in your spare time. But when you are in the class, please don’t do that.

小题1:A. different                B. easy               C. common

小题2: A. before                  B. when                C. after

小题3: A. for                    B. between              C. among

小题4: A. chairman               B. captain              C. champion

小题5: A. or                     B. and                  C. with

小题6: A. were sent              B. sent                 C. was sent

小题7:A. each                  B. Both                  C. Every

小题8:includes                 B. included              C. including

小题9:A. become                B. became               C. becomes

小题10: A. quite good            B. quite well            C. quite better

单项选择题