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【单选题】
（ ）又称湿含量或绝对湿度，指湿空气中水蒸气的质量与绝干空气的质量之比。A.
湿度
B.
相对湿度
C.
表面湿度
D.
实际湿度
E.
表层湿度
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【单选题】I ____ a precious book in a used book store. It became an important source of reference for my paper.
A.
stumbled upon
B.
stumble upon
C.
stumbled over
D.
stumble into
【单选题】Look! This is my new room, and that’s ______.
A.
John and his brother’s
B.
John's and his brother’s
C.
John and his brother
D.
John's and his
【单选题】Look! This is my new room, and that’s ______.
A.
John and his brother’s
B.
John's and his brother’s
C.
John and his brother
D.
John's and his
【单选题】After that, I found Morrie Schwartz, my25 professor, 25.
A.
lovely
B.
precious
C.
happy
D.
favorite
【单选题】The cottage will be cold.Make sure ___ the heater.
A.
you light
B.
lighting
C.
you’ll light
D.
for lighting
【单选题】I ____ a precious book in a used book store. It became an important source of reference for my paper.
A.
Stumble into
B.
Stumbled over
C.
Stumbled upon
D.
Stumble upon
【单选题】—Henry, ________ the light is ________ when you leave the lab. —All right. [ ]
A.
be sure; turned on
B.
make sure; turned off
C.
sure; turning off
D.
make sure; turning off
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