The box is full. please _____ it.
A. empty
B. sharpen
C. fill
D. full
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This room is not clean. It is very_____.
A. tidy
B. untidy
C. clean
D. not dirty
_____ not ______ the refrigerator.
A. did, clean
B. Does, clean
C. Do, clean
D. do, clean
Put these _____ in the wardrobe.
A. clothes
B. cloth
C. cloths
D. chothing
在室温下,相同浓度的蔗糖溶液与食盐水溶液的渗透压相等。
A. 对
B. 错