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水分子的四面体结构中两个O-H键间的夹角为

A. 109°28′
B. 108°25′
C. 104.5°
D. 109°25′

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A. He was ordered to clear the apartment by his mother last time.
B. He has not cleared the apartment since his mother's visit.
C. He has cleared the apartment several times since his mother's visiting.
D. He asked his mother to clear the apartment last time.

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The 40th Amendment to the U.S. Constitution was approved by congress in 1868.

A. T
B. F

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Birthright citizenship is part of the 14th Amendment to the U.S. Constitution, which was approved by Congress after the Civil War.

A. T
B. F

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Australia, New Zealand, Iceland, France, India, Malta, the United Kingdom and Portugal all have changed their policy about birthright citizenship since 1991.

A. T
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水分子的四面体结构中两个O-H键间的夹角为

A. 109°28′ B. 108°25′ C. 104.5° D. 109°25′

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The 40th Amendment to the U.S. Constitution was approved by congress in 1868.

Birthright citizenship is part of the 14th Amendment to the U.S. Constitution, which was approved by Congress after the Civil War.

Australia, New Zealand, Iceland, France, India, Malta, the United Kingdom and Portugal all have changed their policy about birthright citizenship since 1991.

A. 109°28′
B. 108°25′
C. 104.5°
D. 109°25′

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