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【单选题】
分光光度法的仪器中，光源的作用是A.
光源的作用是提供所需波长范围内的连续光谱
B.
光源的作用是提供激发样品所需的能量
C.
光源的作用是提供反应所需的能量
D.
光源的作用是提供所需的单色光
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举一反三
【单选题】I’m considering ________a washing machine, which is considered ________a great help to my wife.
A.
buying; to be
B.
buying; being
C.
to buy; being
D.
to buy; to be
【单选题】There is something wrong with my washing machine. I must have it______.
A.
check
B.
checking
C.
to check
D.
checked
【单选题】There is something wrong with my washing machine and it requires _____.
A.
repairing
B.
to repair
C.
being repaired
D.
having repaired
【单选题】I don't like washing my clothes_______. I usually washing them by a washing machine.
A.
by hand
B.
use hand
C.
by machine
【单选题】---- Where is my blue shirt? ---- It’s in the washing machine. You have to wear ____different one.
A.
any
B.
the
C.
a
D.
other
【单选题】— Where is my blue jeans? — It's in the washing-machine. You'll have to wear _____ different one. [ ]
A.
any
B.
the
C.
a
D.
other
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