2．Fifteen years ago，when darkness used to fall in Yobe Nkosi，a remote village in ：northern Malawi，children did their school homework by candlelight：There was no electricity.But that started to change in 2006，when villager Colrerd Nkosi finished secondary school in Mzimba，some 40 kilometres away，and returned home，and found he could no longer live without power.
Aged 23 at the time，Nkosi soon figured out that a small river past the house where he grew up had just enough force to push the pedals on his bicycle.He created a generator（ 發(fā)電機(jī)） that brought power into his home.Word spread quickly among brick houses and neighbors.Began paying regular visits to charge their mobile phones."I started getting requests for electricity and decided to upgrade，" said Nkosi.
With no previous training，he turned an old fridge compressor（ 壓縮機(jī)） into a water powered turbine（渦輪） and put it in a nearby river，generating electricity for six households.Today，the village is supplied by a bigger turbine.
The users pay no fee for the power but give Nkosi some money for maintenance一slightly more than ＄1 per household per month."The electricity is basically free ，"Nkosi said，speaking in local Chichewa.He admitted that the maintenance income was too small to cover repair costs，which.he mainly funded from his own pocket.；
Despite the challenges，he is determined to expand his mini electricity network to surrounding areas."Once more villages and schools have electricity，people will no longer cut down trees for charcoal（炭） ，"he said."Students will have a lot more time to study"，he said.
As dusk settles over Kasangazi Primary School，groups of learners rush into a classroom for a night-time.study session."Before we had electricity here，we used to use candles to study，"" said student Gift Mfune，sorting through a pile of text books on his desk. "Now，we all have no excuse but to pass our examinations ，"he laughed.Courtesy of Nkosi，the building is the only school with power out of 17 others servicing the area.
（1）Why did Nkosi's first generator need upgrading？
A．To make much more money.
B．To attract more people's visits.
C．To charge more mobile phones.
D．To meet more people's requests.
（2）Which words can best describe Nkosi？
A．Mean and stubborn.
B．Creative and generous.
C．Wealthy and humorous.
D．Narrow-minded and short-sighted.
（3）What can we know about the students in Kasangazi Primary School？
A．They have to stay up late.
B．They did not do well in exams.
C．They are very grateful to Nkosi.
D．They must have a promising future.
（4）What's the author's purpose in writing the text？
A．To share a touching story.
B．To advertise a remote village.
C．To show students' love for a teacher.
D．To remember a respectable engineer.
