题目内容：

These devices were among the thousands featured at this year’s Consumer Electronics Show, a conference that brings industry experts together to share the latest and greatest in tech.

A food baby-friendly belt

College students are familiar with “food babies,” big stomachs caused by eating a little — okay, a lot — too much. This smart belt automatically adjusts to your stomach size. That’s right. When you overeat, Belty expands with your stomach.

“You’ll definitely know how many months into the pregnancy you are,” jokes Steve Greenberg, author of Gadget Nation, who just got back from CES.

If you don’t want to use Belty while pigging out, you can take advantage of its health-related features instead. Along with shifting size, Belty tracks food intake and exercise. It even vibrates(振动) if you’ve been inactive too long.

The Rocket Power characters’ dream product

Most students walk, bike or skate across campus. But with Rocketskates, which are electronic, motorized skates tied to your regular shoes, you can move very quickly.

The skate’s wheels, which are run by a microprocessor, get going when you lean forward and stop when you lean back. Top speed is 12 miles per hour, meaning you could leave your dorm at 7:56 and be on time for your 8:00 class. And you can carry them afterwards, since they’re light-weight.

A magical microwave

Most 3D printers turn plastic into 3D objects. But XYZprinting’s version turns flour and chocolate into cookies, cake and candy.

The printer, which is about the same size as a traditional all-in-one version, is simple to use. You select a 3D food item from the company’s database of “recipes”, all of which have been approved by a food specialist. Within minutes, your food is ready.

The “why hasn’t someone invented this sooner” phone charger

Everyone knows college students are busy — mostly because we take every available opportunity to say so.

The StoreDot FlashBattery can’t solve scheduling issues for smart phones, but it does make life easier by completely charging them in one minute.

Doron Myersdorf, StoreDot CEO, calls the battery’s quick-charging time “ideal” for college students. He even visualizes free StoreDot stations on campus that would make carrying a charger unnecessary.

1.What’s the main function of Belty?

A. To track food intake and exercise.

B. To warn you it’s time to get up and exercise.

C. To predict how long a person has been pregnant.

D. To make your stomach comfortable by shifting size.

2.Which of the following is true about Rocketskates?

A. It is powered by your feet.

B. It can run as fast as a car.

C. You may start it by leaning forward.

D. It is too heavy to carry by hand.

3.How does the new 3D printer differ from traditional versions?

A. It is much smaller in size.    B. It turns flour into 3D food.

C. It turns plastic into 3D objects.    D. It is operated by a food specialist.

4.Which of the following is true?

A. The author believes college students are very busy.

B. Free StoreDot stations are available on campus now.

C. The FlashBattery charges a phone unbelievably quickly.

D. Doron Myersdorf is not satisfied with the FlashBattery.