A.The efficiency increases
B.The efficiency decreases
C.The efficiency remains the same
D.The efficiency cannot be determined.
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A.Shuga
B.Floe
C.Spicule
D.Bergy bit
A.To navigate intentionally
B.To navigate intensely
C.To navigate carefully
D.To navigate completely
A.Dilated pupils and shallow breathing
B.Diarrhea and frequent urination
C.Muscle tenseness in almost the entire abdomen
D.Extreme sweating and reddening skin
A.borrow
B.lend
C.take
D.let
A.deep water
B.shallow water
C.stiff soils
D.soft soils
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Fog forms when the air（）.
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