单选题While on watch at sea you must maintain a proper lookout at all times. On a 700-foot cargo vessel being hand-steered during daylight hours in good visibility and clear of any navigational hazards，the lookout may be（）.A the helmsmanB the mate on watchC

A、by sea, at sea

B、by the sea, at the sea

C、by the sea, at sea

D、by sea, at the sea

While on watch at sea you must maintain a proper lookout at all times. On a 700-foot cargo vessel being hand-steered during daylight hours in good visibility and clear of any navigational hazards，the lookout may be ______.

A.the helmsman

B.the mate on watch

C.Either A or B

D.Neither A nor B

—May I watch TV for a while？

—No,you .You have to finish your homework first.

A.shouldn't B.needn't C.mustn't D.won't

While underway and towing an unmanned tank barge you are required to ______.

A.maintain a strict watch on the barge from the towing vessel

B.fly a red flag from the towing vessel

C.open the tops of all empty tanks on the barge

D.take hourly soundings of any loaded tanks on the barge

The term SEAWORTHY TRIM means ______ the ship must be in trim to meet the perils of the passage by sea to the next port not only in the sense that she should be left with an adequate amount of cargo to keep her on an even keel，but also that where necessary part of her cargo should be bagged to stop it shifting while out at sea．

A.it

B.that

C.where

D.while

3．—__________ 1 go out for a while?

—No，you __________ You must finish your homework first．

A． Must，needn't

B． Can，may

C． May，mustn't

D． May，must

While on watch at sea you must maintain a proper lookout at all times. You are on a 200-foot cargo vessel with an unobstructed view astern from the steering position. The vessel is being hand-steered during daylight hours in good visibility and clear of any navigational hazards. The lookout may be ______.

A.the helmsman

B.the officer on watch

C.either A or B

D.neither A nor B

You look well . The air and the sea foods in Sanya must _____ you , I suppose. ( )

A.agree with

B.agree to

C. agree on

D. agree about

Providing you are not sailing in the Red Sea or another special area as listed in ANNEX V of MARPOL，how many miles from land must you be to throw garbage including bottles，rags，and glass that has not been ground up into the sea?

A.3 nm

B.6 nm

C.12 nm

D.25 nm

Your tow includes a barge carrying chlorine．Which special requirements must be observed ________．

A.The wing voids shall not be opened when underway

B.You must post a deckhand to keep a special watch on this barge

C.A cargo information card for chlorine must be in the pilothouse

D.All of the above