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單項選擇題

What happens to the efficiency of an anchor when it is moved from sand to mud?（）

A.The efficiency increases
B.The efficiency decreases
C.The efficiency remains the same
D.The efficiency cannot be determined.

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單項選擇題

What form of ice is of land origin?（）

A.Shuga
B.Floe
C.Spicule
D.Bergy bit

單項選擇題

What does the term TO NAVIGATE WITH CAUTION mean?（）.

A.To navigate intentionally
B.To navigate intensely
C.To navigate carefully
D.To navigate completely

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