如图是人体消化系统组成示意图，对图中④小肠的描述正确的是（ ） A．可以分泌胰液

阅读理解。

     This is a picture of Kate Green's family. In the picture we can see her grandparents, her parents, her

brother Mike and her.

      Her grandparents are on the chair. Mr. Green and Mrs. Green are behind them. Mike is under the

window, Kate is on the floor. What's behind Kate? It's a cat. It's black and white.

1. How many (多少) people are there in the Kate's family? [ ]

A. Four

B. Five

C. Six

D. Seven

2. Where is Mrs. Green? [ ]

A. Under the window

B. On the floor

C. Behind Kate

D. Behind the chair

3. Is Mike on the floor? [ ]

A. Yes, he is.

B. Yes, he isn't.

C. No, he is.

D. No, he isn't

4. Where is the cat? [ ]

A. On the floor

B. Under the window

C. Behind Kate

D. On the chair

5. What color is the cat?[ ]

A. White

B. Black

C. Yellow

D. Black and white

脑内多发性硬化最常见部位是（）

A.侧脑室周围白质

B.视交叉及视神经

C.基底节

D.脑干

E.小脑白质

阿托品抗休克的主要机制是

A．加快心率，增加心排出量

B．扩张肾血管，改善肾功能

C．扩张血管，改善微循环

D．兴奋中枢，提高机体功能

E．收缩血管，升高血压

一对标准安装的渐开线直齿圆柱齿轮外啮合传动，已知中心距a=100mm，z₁=20，z₂=30，α=20°，，c^*=0.25。试求：

(1)齿轮的模数m；

(2)齿轮2的分度圆直径d₂、齿顶圆直径d_a2、齿根圆直径d_f2和基圆直径d_b2。

经济作物的布局原则有（）。

A.因地制宜，择优布局，适当集中

B.尽可能在产区建立加工工业

C.产区应有良好的交通运输条件

D.产区应有充裕、技术素质较好的劳动力