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【单选题】
in the study lost in thought for a long time, I suddenly realized that nothing in the world remains .A.
Having sit; unchanged
B.
To sit; unchanging
C.
Sitting; unchanged
D.
Sitting; unchanging
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举一反三
【简答题】一圆锥的侧面展开图是半径为2的半圆，则该圆锥的全面积是 ▲ .
【单选题】Wherever he traveled in those days, he always _______ down what he saw and heard.
A.
writes
B.
has written
C.
wrote
D.
had written
【简答题】一圆锥的侧面展开图是半径为2的半圆，则该圆锥的全面积是 .
【简答题】棱锥的侧面都是（ ）形，圆锥的侧面展开图是（ ）形。
【简答题】已知圆锥的侧面展开图是直径为8cm的半圆，则这个圆锥的侧面积是 cm 2 .
【简答题】圆柱的侧面展开图是________；圆锥的侧面展开图是________.
【单选题】In those days, he would go to Mr. Black and his family, __________.
A.
where he was treated as part of them
B.
for whom it was good
C.
that was the most important part of his life
D.
with whom he had a wonderful time
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