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【简答题】
正常成人的视盘直径约为（ ） A. A．0.5mm B．1.0mm C．1.5mm D．2.0mm E．2.5mm
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举一反三
【单选题】When people speak of solar energy, they think only of the sun's rays heating a home or ______ electricity from the sun.
A.
derive
B.
by deriving
C.
of deriving
D.
to derive
【单选题】The exploitation of the power in the Sun's rays is a form. of alternative energy now showing new commercial promise. In the US, manufacturers have made important 【C1】______ in the development of the t...
A.
strides
B.
background
C.
investments
D.
strategy
【单选题】All the creatures depend on the sun's rays for the light and warmth which ______ us alive.
A.
keeps
B.
keep
C.
kept
D.
is keeping
【单选题】Air and the sun's rays create much distortion, and whatever tends to _____ their influence is useful to the astronomer.
A.
exclude
B.
eliminate
C.
extinguish
D.
impose
【单选题】We depend on the sun's rays. for the light and warmth which ______ us alive.
A.
keep
B.
keeps
C.
kept
D.
is keeping
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