题目内容：

    The electricity bill for an average family with 2 children is worth about 1 full salary per year, but the revolutionary EcoVolt could put 50% of that money back into your pocket.

In 2017, a revolutionary new product called EcoVolt hit the market. Initially it was separated from the general public, all because it offered the opportunity for average families to save up to 50% of their monthly energy costs. EcoVolt is a small, simple, affordable, and easy to use plug in unit that stops unnecessary power from entering the electrical cables and overloading the network, EcoVolt is the utility (公用事业) provider' s best-kept secret. They 've been trying to hide it from the everyday power consumer and even have banned the sale of it in retail shops —just to maximize their profit. However, thanks to the internet, the secret is now out, and everyday customers are now attaining the rewards of less power consumption overall, as well as less power used by household appliances. Your household appliances (家用电器) may last longer than previously. Basically, EcoVolt provides the opportunity for you to save between 30 and 50 percent on your energy bill. That's a phenomenal saving and leaves few questions as to why this has been hidden from consumers.

The benefits of EcoVolt are huge, and researchers are convinced this device could spell the end of unaffordable power bills that can cripple the average wage earner at the end of the month. Scientists initially spent many months trying to expose its efficiency, but those studies now prove that EcoVolt should be common in every household.

It's easy to connect, simply by plugging it into your wall, and it's suitable for both standard homes and apartments connected to a power grid (电网). It also has a counter which shows how you're making more efficient use of your energy, all the while allowing you to gain the rewards of a more everlasting household appliance lifecycle. In just 1-2 months, you've made your money back on your initial purchase.

1.What do we know about EcoVolt?

A.It is a new affordable website service.

B.It is a revolutionary new network product.

C.It is a new simple electricity- saving device.

D.It is a revolutionary electrical money-saving app.

2.What does the underlined word “cripple" in paragraph 4 mean?

A.Bring many benefits.

B.Bring too much burden.

C.Get rid of difficulty.

D.Get into debts.

3.How does EcoVolt benefit consumers?

A.It helps consumers save much on their electricity bill.

B.It makes it easier for consumers to use appliances.

C.It connects more families to the Internet.

D.It makes electricity use much securer.

4.We can infer from the last paragraph that EcoVolt ______.

A.is very convenient and favourable

B.is suitable for both home and public use

C.will be an everlasting household appliance

D.can help gain rewards of purchase discount