问题 单项选择题

与单纯扩散相比,易化扩散的特点是()

A.转运的为小分子物质

B.不需细胞膜耗能

C.顺浓度差转运

D.需膜上蛋白质的帮助

E.能将Na+泵出

答案

参考答案:D

阅读理解

C

A young woman carrying a three-year-old child got on a bus. The conductor(售票员) hurried to give her a warm welcome and then kindly asked the other passengers to make more room for the woman and her child. On seeing this, people began to talk. "You know this conductor used to be very rude. Now suddenly he has changed his bad behavior , "said a middle-aged man.

"Yes, he should be praised and we must write a letter to the company," said a second passenger. "That's right," another lady said, "I wish a newspaper reporter were here so that more people could learn from this conductor. "

Just then a gentleman who looked like a teacher turned to the conductor and said , "Excuse me, but can I know your name, please? Your excellent service must be praised..."

Before he could open his mouth, the three-year-old child sitting on the young woman's lap interrupted, "I know his name. I call him Dad."

46. The passengers were ________ to see the conductor's kindness to the woman and the child.

A. excited       B. unpleased      C. interested     D. surprised

47. One passenger suggested writing a letter to the company to ______.

A. make a demand for more buses

B. thank the conductor for his good service

C. criticize the conductor for his rude behavior

D. invite a newspaper reporter to write about the conductor

48. What was the gentleman?

A. A teacher.                      B. A newspaper reporter.

C. Not known from the story.         D. The conductor's friend from his company.

49. The word "he" in the last paragraph refers to _______.

A. the gentleman                 B. the conductor

C. the middle-aged man           D. the three-year-old child

50. It is clear from the story that the conductor _______.

A. has changed his attitude towards his work

B. has now been kind and polite to all passengers

C. has not changed his rude behavior to passengers probably

D. has now been kind and polite to women with children

单项选择题