单项选择题

A．Pierre is their new teacher.
B．They like Marie better than Pierre.
C．They think the class is very boring.
D．Marie is their last term teacher.
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____________________________ (她不可能已上交论文) for she didn’t start until yesterday.
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For many people, electricity is a vital part of everyday life and is often taken for granted. But not everyone has (36) to it. Improving the supply and availability of electricity across the world has (37) scientists for decades. Now, however, technological advances mean that a cheap, safe (38) of electricity may soon be available virtually anywhere on the planet. The idea is to harness the sun’s energy by using satellites. Of course, solar-powered satellites are not a new idea. But it is only (39) recently that technology has advanced far enough to make the idea a (40) possibility. The basic idea is that the solar-powered satellites will (41) the energy in sunlight into electricity. The energy will be (42) to earth in the form of microwaves, which will be collected by a (43) known as a microwave collector. A re-conversion plant (44) . The type of solar-powered satellites is able to produce electricity extremely efficiently, with less absorption and scattering of radiation. Each solar panel used for harnessing solar energy will be only 200 metres long, and also very light in weight. (45) . Scientists are anxious to reassure people about the safety of microwaves. (46) . However, if the microwaves operate at the correct frequencies, scientists assure us that people and the environment should both be safe.
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