大肠杆菌的主要生物学特点是（）。 A.革兰染色阴性、能发酵乳糖

搜题请搜索小程序“爱下问搜题”

问题单项选择题

大肠杆菌的主要生物学特点是（）。

A.革兰染色阴性、能发酵乳糖、产酸产气

B.革兰染色阳性、能发酵乳糖、产酸产气

C.革兰染色阴性、能发酵葡萄糖、产酸产气

D.革兰染色阳性、能发酵葡萄糖、产酸产气

E.革兰染色阴性、能发酵乳糖、产酸不产气

答案

参考答案：A

阅读理解

根据短文内容判断正误，对的画“ T”，错的画“ F”。

Today is Sunday. Jenny wants to go shopping in the city. But her father says, " It's too far. We have to

take the car." Her mother says, " The car is broken. We have to take a taxi." Her father says," It's too expensive!

We have to take the bus." Her mother says, " It's too cold! We have to stay at home." So she says to Danny,

"Let's go to the city today. We'll ride our bikes to the city." Danny says, " Okay!" They'll go to the park to play.

( ) 1. Jenny wants to go to school.

( ) 2. Jenny's mother says, " The car is broken."

( ) 3. They'll go to the park to fly kites.

( ) 4. Jenny's father says," We have to take a taxi."

单项选择题

下列哪些不是癌前病变

A．上皮不典型增生

B．交界痣

C．炎性息肉

D．粘膜白斑

E．萎缩性胃炎