问题 单项选择题

下列因素中,哪一个因素是保持婴幼儿特别是新生儿心输出量的最重要因素

A.心肌收缩力
B.心率
C.血容量
D.心室舒张末期容积
E.心室顺应性

答案

参考答案:B

解析:新生儿心肌的结缔组织成分约占一半,而在肌原纤维间散在分布着非收缩性组织,因而组织顺应性较低,舒张功能受限,心肌收缩力亦较弱。因此,心率是保持心输出量最重要的因素。

单项选择题
阅读理解

四、阅读理解(共两节,每小题2分,计40分)

第一节(共15小题,每小题2分,满分30分)

Mr White came out of the airport. He asked every taxi-driver’s name. Then he took the third taxi. It cost $5 from the airport to the hotel,“ How much does it cost for the whole day? ”he asked.

“$100,” said the taxi-driver. This was very expensive but Mr White agreed.

The taxt-driver took Mr White everywhere. He showed the driver $100 and said, “what about tomorrow?”

“Tomorrow? It’s another $100 tomorrow.”

“Ok,” said Mr White, “If that’s the price, see you tomorrow!” The driver was very pleased.

The next day they traveled to several places. And in the second evening they went to the hotel again. Mr. White and above all, $100 a day is good money. So he asked Mr White, “Where do you come from?”

“I come from New York.” Mr White answered.

“New York!” said the driver, “I have a sister in New York. Her name is Susannan. Do you know her?”

“Of course I know her. She gave me $200 for you.”

1. Mr White got to another place _______.

by train B. by air  C. in plane D. by ship

2. The price of $ 100 a day was _____ in this city.

A. expensive  B. cheap  C. nice   D. fair

3. Why was the taxi-driver pleased? Becaude _____.

his sister brought so much money to him

his sister knew Mr White

he got $100 a day

he became a guide of Mr White

4. We can learn that ____ from this story.

Mr White didn’t know the taxi-driver’s sister

the driver knew Mr White was his sister’s friend

Mr White was given back $ 200

Mr White knew the taxi-driver’s sister