题目内容：

The biggest challenge faced by travelers especially those who like to have a hiking trip is how to ensure a steady supply of clean clothes. Now, thanks to a great invention called Scrubba Wash Pack, that worry may be a thing of the past.

The portable(手提的) washing machine was invented by Ash Newland in 2010, while planning to climb Mt. Kilimanjaro. Struck by the limited packing space, he got inspiration(灵感) from traditional washboards to create a bag that could be used to clean clothes. Then he gave up his career as a lawyer and focused on perfecting the bag’s design. By 2012, the bag was ready for the public. It weighed only 180 grams and required very little storage space, making it perfect for anyone wishing to travel light.

Not surprisingly, the bag worth 55 dollars was an instant hit with travelers, university students and even passengers. However, Newland was not satisfied. He still saw a flaw(缺点) with his invention – dirty clothes had to be carried around in a separate bag! The recently introduced Scrubba Wash Pack solves that problem.

In order to make the pack active, dirty clothes are placed inside the bag along with two to three liters of water. The bag is then shut tightly to ensure all air is squeezed out(挤出去) and the clothes are massaged for a few minutes. After a quick wash, they are clean and ready to be dried. According to Newland, the pack can clean anything from jeans to smelly socks! What’s even more amazing is that with a capacity to hold 13-liters of water, it can be used to wash more clothes at a time.

The best part is that the 99-dollar pack that will be available for sale later this year, only weighs 300 grams and is completely foldable, making it easy to store when it’s not in use. With the Scrubba Wash Pack, wandering through foreign cities searching for a washing shop, or paying for washing machines may soon be a thing of the past!

1.What led Ash Newland to create the Scrubba Wash Bag?

A. His job requirements.    B. His personal experience.

C. His interest in invention.    D. A traditional washboard.

2.Why wasn’t Ash Newland satisfied with his former invention?

A. The invention was not so convenient.

B. Clothes couldn’t be washed well.

C. The bag couldn’t contain enough water.

D. The cost of the invention was very high.

3.It can be inferred that the improved Wash Pack ______.

A. turns to be much environmentally friendlier

B. will replace the traditional washing machines

C. can encourage more people to travel a long distance

D. will be widely used by more travelers in the future

4.What is the passage mainly about?

A. Introducing a great new invention.

B. Explaining the development of backpack

C. Listing some common problems for travelers.

D. Comparing two kinds of washing machines.