题目内容：

    As long as there have been exams, students have found ways to cheat. Today the correct answers are just a few taps away on a smart phone. So countries have come up with new ways to stop the funny business. Some use metal detectors, surveillance (监控) cameras, and mobile phone jammers (干扰器).1.

Cheating in high school leaving exams got so bad in Mauritania and Algeria that this year the authorities turned off the Internet for the entire country. Algeria did so for at least an hour during tests (which last about a week).2.Other countries, such as Iraq, Uzbekistan and Ethiopia, have for years been shutting down the Internet during exam time.

In each country students are under high pressure to do well in the tests, which often determine whether they can continue their education at a good university.3.But high marks are rare. In Algeria only around half of students passed the exams in recent years. In Mauritania the rate is much lower.

4.Darrell West of the Brookings Institution, a think-tank, estimates that in 2015-2016 Internet shutdowns ordered by governments cost countries at least $2.4bn. 5.

A.Turning off the Internet is expensive.

B.Teachers try to help — in their own way.

C.Others have taken a more severe measure.

D.A splendid grade may mean a scholarship abroad.

E.Mauritania cut access from morning until evening on exam days.

F.For that kind of money, countries could even improve their schools.

G.With so many students cheating electronically, governments are taking extreme steps.