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Why do some scientists study how plants convert sunlight carbon dioxide, and water into sugars and starches？ _______A Because they want algae to produce sugars and starches.B Because they want green plants to become a new source of energy.C Because they want to turn plant sugars to a new form of energy.D Because they want to make photosynthesis more efficient.
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此处正确答案是[A]as if[B]SO that[C]even though[D]now that
What is the purpose of this writing？[A]To sell Chan's flat for moremoney． [B]To tell people how to takecare of small flats． [C]To introduce to readers acleverly-designed flat． [D]To call on engineers todesign their own homes．
[A]in [B]on [C]under [D] between
Where is Chan's flat？[A]Next to a big house． [B]Under an old buildin9． [C]In a busy London street． [D]By the side of a countryroad．
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