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问题 单项选择题

窦房结作为心脏的正常起搏点是因为（）

A.0期去极化速度最快

B.4期自动去极化速度最快

C.静息电位水平最低

D.没有明显的平台期

E.有最大舒张电位

答案

参考答案：B

阅读理解

阅读理解。

Dear Mary,

    Thanks for your letter and your nice photos. You really have a big family.

From the photos, I also know you have a pet dog. It's great.

    I like animals very much, too. My favorite animals are pandas. They're so

cute and they're from China. Do you know the two pandas "Lele"and

"Yingying"? They're in Hong Kong now. I think people all like them. Do you

know when the World Animal Day is? It's October 4th.

    I like animals but my parents don't. They think they're dirty. I want to have

a pet dog very much. Dogs are people's good friends. They're clever. But in

China, it's not easy to have a pet dog. We must pay much money on it. So

please give me more photos about your dog, OK? 

                                                                                 

                                                                                 Yours,

                                                                              Gina Miller

1.Miller is Gina's _________.

A.first name

B.last name

C.given name

D.friend

2.Gina and Mary are _________.

A.classmates

B.sisters

C.pen pals

D.cousins

3.________ don't like animals.

A.Gina's parents

B.Mary

C.Gina

D.Mary's parents

4.World Animal Day is "________" in Chinese.

A.国际动物日

B.动物世界

C.熊猫节

D.动物园庆祝日

5.Gina wants Mary to give ________ to her.

A.a dog

B.some animals

C.some photos

D.two pandas

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选择题

下表是某逻辑电路的真值表，该电路是

[ ]

A、

B、

C、

D、
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