单项选择题

Generally speaking, the bird flying (across) our path is observed, and (the one) staying on the tree near (at hand) is passed by (without noticed).

A．across
B．the one
C．at hand
D．without noticed
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单项选择题
A significant (proportions) of the plants and animals (of) Hawaii exists (nowhere else) in (the world).
A．proportions
B．of
C．nowhere else
D．the world
单项选择题
Early forms of life on Earth, ______ in absence of oxygen, required other elements.
A．which lived
B．that lived
C．lived
D．were living
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