问题 单项选择题

降低一个IgD值所需升高的温度,称为

A.D0

B.F0

C.D值

D.F值

E.Z值

答案

参考答案:E

解析:Z值是指降低一个lgD值所需升高的温度,即灭菌时间减少到原来的1/10所需升高的温度或在相同灭菌时间内,杀灭99%的微生物所需提高的温度。

阅读理解

A passenger(乘客)told an air hostess that he needed a cup of water to take his medicine when the plane just took off. She said to him that she would bring him the water in ten minutes.

The air hostess was kept so busy that she forgot to give him the water. As a result, the passenger was held up to take his medicine. Thirty minutes later, when the passenger’s ring for service sounded, the air hostess hurried over to him with a cup of water, but he refused it.

In the following hours on the plane, each time the air hostess passed the passenger, she would ask him with a smile whether he needed help or not. But the passenger never replied to her.

When the passenger was going to get off the plane, he asked the air hostess to hand him the passenger’s booklet. She knew that he would write down sharp words about her job, but with a smile she handed it to him.

Off the plane, the air hostess opened the booklet, and smiled because the passenger wrote, “On the flight, you asked me whether I needed help or not for twelve times in all. How can I refuse your twelve sincere smiles?”

小题1:The passenger needed a cup of water because_________________.

A.He was thirsty.

B.He wanted to take his medicine.

C.He wanted to chat with the air hostess.

D.He felt bored小题2:At the end of the story, we know the passenger was __________ with the air hostess.

A.pleased

B.unhappy

C.angry

D.bored小题3:The underlined word “it” in Paragraph 4 refers to the ___________.

A.medicine

B.water

C.cup

D.booklet

单项选择题