【单选题】
In the US, manufacturers have made important{{U}} (26) {{/U}}in the development of the technology to bring down the cost of solar conversion systems{{U}} (27) {{/U}}improving their reliability.
The direct conversion of solar{{U}} (28) {{/U}}electrical energy, using photovoltaic cells{{U}} (29) {{/U}}distinct advantages as an alternative energy option.
{{U}} (30) {{/U}}other forms of renewable energy, photovoltaic is based on modular solid state devices which can be mass{{U}} (31) {{/U}}at a relatively low cost.
Here wafers of silicon—not dissimilar{{U}} (32) {{/U}}ones which are turned into silicon chips—{{U}} (33) {{/U}}an electric current when light falls upon them.
When built into panels or modules where each cell interconnects, the amount of electricity generated can be large enough to{{U}} (34) {{/U}}a home or even a community.
Over the past 10 years, {{U}} (35) {{/U}}extensive research and substantial Government and private industry funding, the price of photovoltaic modules has dropped{{U}} (36) {{/U}}.
{{U}} (37) {{/U}}in 1973-74 the price per peak watt was between US $100 and $150, commercial prices for small array system now vary between $6.50 and $7 per watt.
This rapid price reduction has been accompanied by a 400 per cent jump in the{{U}} (38) {{/U}}efficiency of photovoltaic modules.
{{U}} (39) {{/U}}solar cells are poor converters of sunlight to electricity.Early cells could only manage to mm about five per cent of the incident rays into electricity, but recent development have increased{{U}} (40) {{/U}}to more than 10 percent.
B．produced
C．harnessed
D．erected
网考网参考答案：B
网考网解析：
此处意为“能够以较低的成本被大量生产”。 document.getElementById("warp").style.display="none"; document.getElementById("content").style.display="block"; 查看试题解析出处>>
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