结构化程序设计的三种基本逻辑结构为顺序、选择和 【1】 。

阅读短文，选择正确答案。

      Water is all around us. Water is in the ocean. Water is in the lakes and rivers. Water is in the air. There is

more water than land on the earth. All things must have water to live. The plants must have it. The animals must

have it. We must have it, too. We cannot live without drinking water. Sometimes, we do not have all the water

that we need. The land will dry up without water. Sometimes, there can be too much water in the land. If it rains

very, very hard, the rain water will run down the hills. It takes some of the land with it when it runs down the

hills. It is called erosion when the water takes the land away. 

      Water on the earth will never be used up. It goes from the ocean to the air to make clouds. Then, it falls

from the clouds down to the land. It runs off the land and out to the ocean again. The clouds make rain. The rain

falls onto the land. Some of it goes into the ground. Some of it washes down and goes back into the ocean.

Some water that falls down from the clouds is not rain. Some of it washes down and goes back into the ocean.

Some water that falls down from the clouds is not rain. Some of this water is snow. The snow is made of

water. Some water that is not rain or snow falls down from the clouds. Some of this water is sleet (雨夹雪).

The sleet is made of little pieces of ice. Some water that is not rain or snow or sleet falls down from the clouds.

Some of this water is hail (冰雹). The hail is made of ice balls!

1．According to the passage, we know that ________. [ ]

A．We can live without water

B．the animals don't need water

C．Human beings can't live without water

D．only plants must have water

2．Which of the following is not made of water? [ ]

A．Snow

B．Sleet

C．Hail

D．Land

3．"Erosion" in the passage means ________. [ ]

A．地震

B．雪崩

C．侵蚀

D．霜冻

4．Which of the following shows the water cycle (循环)? [ ]

A．Water from the ocean→air→clouds→ rain→land→ocean

B．Water in the air→clouds→rain→land→hail

C．Water in the clouds→snow→land→ocean

D．Rain→land→river→ocean→storm

声音是由于物体的_________而产生的，声音的传播需要_________。

患者，女性，42岁。甲状腺肿大、突眼、心慌、失眠，心率100/min，血压130/80mmHg（17.3/10.7kPa），诊断为甲状腺功能亢进。

护士为患者记录的基础代谢率是（）。

A.+20%

B.+25%

C.+35%

D.+39%

E.+55%

数组声明语句Dima（0to3，-2to2，0to5）中，数组a包含元素的个数为（）。

A、120

B、75

C、60

D、13

生产力具有复杂的系统结构，其基本要素包括（）。

A、劳动资料

B、劳动对象

C、劳动

D、科学技术