1 .         While there is no widely accepted definition of MOOCs, their key features are open access：they are currently free to participants, no entry qualifications are required, they support an unlimited number of participants and as yet, very few include any form of accreditation (认证).

Currently offered by some famous universities, MOOCs are attractive to people who do not have the financial resources to meet the growing costs of university education, or who do not have formal qualifications. They also allow participants to study at their own pace.

The potential for MOOCs to deliver education is obviously vast—they could be considered as a huge step forwards in widening participation. They also have the potential to provide a unique window on universities that offer popular and valuable courses, they may attract some participants to register for formal fee-paying programmes at the same or other universities and are likely to promote new ways of on-line education.

However, it is still very early days for MOOCs. The quality of the education provision is highly variable, with many courses offering only recordings of lectures, and delivery is particularly difficult in some special fields that require practical classes, research projects or extensive library access. Besides, wider engagement with participants requires very considerable resource. Even limited feedback or examination becomes a major task if there are several thousand students in the class.

Considering the challenges, some people argue MOOCs will soon evaporate (蒸发). But they certainly provide good opportunity for widening higher education, are a means of raising awareness of universities to audiences of tens or hundreds of thousands, and are well worthy of serious consideration.

2 . RichardSolo 1800 Rechargeable Battery

In just minutes a day, plug in and charge your iPhone quickly!

Just plug RichardSolo 1800 into your iPhone once or twice a day, for fifteen minutes, and keep your iPhone charged up. At your desk, or at dinner, plug RichardSolo into iPhone to instantly transfer charge. No more battery worries. RichardSolo will charge iPhone to full 1.5 times, and it is good for 3-5 years of recharges.

Use the iPhone while charging it. Even charge the RichardSolo 1800 and iPhone together at the same time. Take only one charger when traveling and wake up in the morning with the RichardSolo and the iPhone charged.

RichardSolo 1800 is largest in its class and holds its charge for months. Works with almost all iPhone cases.

Your satisfaction is guaranteed(保证), with our 30-day return privilege(特权，权利). If you're not satisfied for any reason, we'll email you a pre-paid return label.

Actual customer comments:

To have your company exhibit such good service is unbelievably refreshing. --- P.S.

This is what I call great customer support. I wish more companies would figure this out these days. Thank you so much. --- D.C.

You have provided me one of the best services I have ever seen on any online/ telephone shopping.--- T.K.

You must have the fastest processing and shipping in the industry! ---M.C.

This is the best customer service experience I have had in a long time. ---L.L.

I've read online about your amazing customer service, and I must say I'm now a true believer. --- B.L.

1. How long does it take the battery to charge up an iPhone?

A．15 minutes.	B．30 minutes.
C．1.5 hours.	D．3 hours.

2. What is special about the battery?

A．It is built in an iPhone.

B．It is the smallest of its kind.

C．It can also be used as a charger.

D．It keeps power for about 30 days.

3. Who mentions the transporting of the battery?

A．P.S.

B．B.L.

C．M.C.

D．T.K.

4. The customer comments on the battery are mainly about its _____.

A．quality

B．service

C．function

D．shopping