①Have you ever noticed that fruits and vegetables are still fresh after a long journey? Using the right vehicle (交通工具) for transporting helps keep the quality of the fruits and vegetables. Reefers can be one of the great helpers.

②Reefers are trucks that work like a large fridge. They have a special system that is designed to help keep products fresh. The system keeps certain temperatures and controls humidity (湿度). At the same time, it lets in fresh air and lets out gases like CO₂. The system has several parts.

·Control unit: Change the temperature, humidity and airing of the reefer container (集装箱).
·Interior fans: Help the air move around inside the container.
·Fresh air vent: Gases can escape through the air vent, and fresh air can flow (流动) inside the container.
·Unit evaporator: Keep the humidity at the right level inside.
·Condenser: Cool the air in the container and move it around.
These parts make reefers a good choice for transporting fruits and vegetables.

③ The reefer temperature for fruits and vegetables is one of the most important factors. It can affect their quality. But reefers only maintain the temperatures of products, not change them. You should make sure products are already at the correct temperature before loading them into the reefer container. The reefer temperature for vegetables should range between -1℃ to 13℃. Here are a few examples: carrots: 0℃; cucumbers: 10℃ to 13℃. For fruits, the proper temperature is from -1℃ to 4℃, like apples: -1℃ to 4℃; grapes: -0. 5℃ to 0℃. The reefer temperature for fruits and vegetables should be proper to provide high-quality products for markets and stores.

④ When using reefers to transport fruits and vegetables, you should know how to pack them correctly. Use boxes that allow for air to move around. Cardboard boxes and plastic bins with holes are OK. Avoid putting boxes too close to the walls of the container, or the air won’t be able to flow smoothly. Separate certain fruits and vegetables from those giving out a gas which makes them ripen faster.

【小题1】What do we know about a reefer from the passage?

A．It’s a system to make fresh air.	B．It’s a truck to transport fridges.
C．It’s a vehicle to keep products fresh.	D．It’s a helper to sell fruits and vegetables.

【小题2】Which of the following about the system is TRUE according to the passage?

A．Fresh air vent changes gases into fresh air.	B．Interior fans let the air out of the container.
C．Unit evaporator can keep the container new.	D．Condenser makes the air cool in the container.

【小题3】What is Paragraph 3 mainly about?

A．What affects the reefer temperature for fruits and vegetables?

B．How does the reefer temperature change fruits and vegetables?

C．What is the proper reefer temperature for fruits and vegetables?

D．How do you know the reefer temperature for fruits and vegetables?

【小题4】Which part of the magazine is the passage probably taken from?

A．Health.

B．Traffic.

C．Farming.

D．Technology.