A birch (桦树) is a tree. It has a smooth bark (树皮) and is usually white. Many people like to drink birch sap. Sap is the juice inside the tree.

People make a hole in the tree. The sap comes out. It comes out very slowly. People usually leave a bottle there and then they leave. When they come back, the bottle is full. Now, there is an app (应用程序). The app sends a message to a person’s phone when the bottle is full.

People believe that birch sap is very healthy. But scientists say that it is not so special. Many people drink it because their parents and grandparents do it, too. People often use the same tree. The sap has no color. It is sweet when it is fresh. It gets sour after a few days.

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1.What can we learn about sap?

A It tastes fresh.

B Its colour is white.

C It is a name of drink.

D It doesn’t have any colour.

解析：选D。D细节理解题。根据最后一段The sap has no color.可知，树液没有颜色。故选D。

2.Which of the following is the right order? People get sap. People leave a bottle there. People come back. People make a hole in the tree.

A b-c-d -a

B d-a-b-c

C d-b-c-a

D c-d-b-a

解析：选C。C细节理解题。根据第二段可知，人们在树上挖一个洞。树液就出来。它出来地很慢。人们通常会把瓶子放在那里然后离开。当他们回来时，瓶子已经满了。然后就可以取树液了。故选C。

3.The app reminds people that the bottle is full ________.

A by playing music

B by making a sound

C by sending a message

D by making a phone call

解析：选C。C细节理解题。根据第二段Now, there is an app. The app sends a message to a person’s phone when the bottle is full.可知，现在，有一个应用程序。当瓶子装满时，该应用程序会向用户的手机发送一条消息。故选C。

4.Why do many people drink birch sap?

A Because it tastes very good.

B Because they follow doctors’ advice.

C Because scientists think it special.

D Because their elders in the family do so.

解析：选D。D推理判断题。根据最后Many people drink it because their parents and grandparents do it, too.可知，很多人喝它是因为他们的父母和祖父母也喝。故选D。