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【判断题】
David Hayden's innovative idea is about a portable swivel camera and software program that allows blind people to see blackboard writing or distant objects on the left side of his tablet.A.
正确
B.
错误
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【单选题】根据以下材料，回答题 Better Solar Energy Systems: More Heat， More Light Solar photovoltaic thermal energy systems， or PVTs， generate both heat and electricity， but__________ （51） now they haven't been very good...
A.
until
B.
unless
C.
when
D.
if
【简答题】Installing solar systems to power homes, schools, health clinics and communities is part of SELF's____________
【单选题】According to the last paragraph, what can be concluded?
A.
Solar and wind energy systems cost a lot for producing electricity.
B.
People had better pay for the utility instead of producing electricity.
C.
Solar and wind energy can provide cheap and continuous electricity.
D.
Solar and wind energy is reasonable and cheap for remote villagers.
【单选题】Rafi says that solar-energy systems ()
A.
are expensive, but they save money in electric bills
B.
are cheaper to put in than other systems
C.
will increase peopleâs electric bills
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