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【单选题】
下列关于稀土离子作为标记物,其荧光特性说法错误的是( )A.
发射光谱很窄，甚至不到10nm
B.
发射光谱和激发光谱会互相重叠
C.
荧光寿命长，荧光半衰期介于10-1000微妙之间
D.
激发光波长范围宽
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举一反三
【单选题】She listened carefully ______ she might understand what the speaker said exactly.
A.
so as to
B.
in case
C.
in order to
D.
in order that
【单选题】_____, Mary would not have hurt herself. [ ]
A.
If she listened to me
B.
As soon as she listened to me
C.
If she has listened to me
D.
Had she listened to me
【单选题】She listened with a________expression on her face,which suggested she didn’t completely understand.
A.
puzzling
B.
frightened
C.
frightening
D.
puzzled
【单选题】The fact that she has been listened to _________her anxieties and dulls the pangs of negative feelings.
A.
relieve
B.
increases
C.
assuages
D.
heightens
【单选题】When I had a problem she listened to me and suggested solutions. She was really ________ .
A.
promising
B.
shocking
C.
understanding
D.
serious
【简答题】你对大学四年的学习有何计划?准备采取哪些措施去实施你的计划?
【单选题】She listened carefully ______ she might hear what the speaker said exactly.
A.
so as to
B.
in case
C.
in order to
D.
in order that
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