物质)． The yellow and orange stone fruits such as peaches are high in the carotenoids we turn into vitamin A and which are antioxidants．As for cherries (樱桃), they are so delicious who cares? However, they are rich in vitamin C．

When combined with berries of slices of other fruits, frozen bananas make an excellent base for thick, cooling fruit shakes and low fat "ice cream"．For this purpose, select ripe bananas for freezing as they are much sweeter．Remove the skin and place them in plastic bags or containers and freeze．If you like, a squeeze of fresh lemon juice on the bananas will prevent them turning brown．Frozen bananas will last several weeks, depending on their ripeness and the temperature of the freezer．

If you have a juicer, you can simply feed in frozen bananas and some berries or sliced fruit．Out comes a "soft-serve" creamy dessert, to be eaten right away．This makes a fun activity for a children's party；they love feeding the fruit and frozen bananas into the top of the machine and watching the ice cream come out below．

24．What does the author seem to like about cherries?

A．They contain protein． B．They are high in vitamin A．

C．They have a pleasant taste． D．They are rich in antioxidants．

25．Why is fresh lemon juice used in freezing bananas?

A．To make them smell better． B．To keep their colour．

C．To speed up their ripening． D．To improve their nutrition．

26．What is "a juicer" in the last paragraph?

A．A dessert． B．A drink． C．A container． D．A machine．

27．From which is the text probably taken?

A．A biology textbook． B． A health magazine．

C．A research paper． D． A travel brochure．

　　　　　　　　　　　　　　　　　　　C

There's a new frontier in 3D printing that's beginning to come into focus：food．Recent development has made possible machines that print, cook, and serve foods on a mass scale．And the industry isn't stopping there．

Food production

With a 3D printer, a cook can print complicated chocolate sculptures and beautiful pieces for decoration on a wedding cake．Not everybody can do that - it takes years of experience, but a printer makes it easy．A restaurant in Spain uses a Foodini to "re-create forms and pieces" of food that are "exactly the same," freeing cooks to complete other tasks．In another restaurant, all of the dishes and desserts it serves are 3D-printed,rather than farm to table．

Sustainability(可持续性）

The global population is expected to grow to 9．6 billion by 2050, and some analysts estimate that food production will need to be raised by 50 percent to maintain current levels． Sustainability is becoming a necessity． 3D food printing could probably contribute to the solution．Some experts believe printers could use hydrocolloids (水解胶体) from plentiful renewables like algae(藻类) and grass to replace the familiar ingredients(烹饪原料)． 3D printing can reduce fuel use and emissions．Grocery stores of the future might stock "food" that lasts years on end, freeing up shelf space