单项选择题

We are flying at a(an) ______ of 20,000 feet.

A．altitude
B．aptitude
C．latitude
D．attitude
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单项选择题
Genes determine ______ the shape of a leaf and the sex, height, and hair color of a child.
A．such as features
B．such features as
C．as such features
D．features, as such
单项选择题
Americans are eating ______ vegetable per person today as they did in 1910.
A．more than twice
B．twice more
C．as twice
D．more than twice as many
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