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The earth ________ to be flat.


  1. A.
    was used to be thought
  2. B.
    used to be thought
  3. C.
    was used to think
  4. D.
    used to think
B
解析:
be used to doing指“习惯于”;be used to do指“被用来做”;used to do指“曾经,(以前)常常”。而本句后的to be flat作think的宾语补足语。
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Huge dust storms blow out over the oceans from dry parts of North Africa and central Asia. Tons of dust are lifted and left as a thin film over the ocean surface. The dust fuels oceanic life.
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An American scientist, Robert Jackson, has shown that when native grassland areas are invaded(侵入) by trees, carbon is lost from the soil. “We are studying why the soil carbon disappears, but one theory is that trees do a lot more of their growing above ground compared to grasses, so less carbon goes directly into the soil from trees, ” says Jackson.
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