单选题If help has not arrived in 10-12 hours after abandoning a vessel in a rescue boat，you should （）.A go in one direction until the fuel runs outB steer a course for the nearest landC steer a course for the nearest sea laneD shut down the engines if instal

A、Sorry, I've had enough

B、Thank you, Helen

C、Help yourself to it, too

If a student has a problem with classroom work，he or she should______.

A. make an appointment with the professor a week before

B. approach a professor after class

C. seek the professor's help in his office

D. go to the professor's apartment

Which of the following is true according to the passage?

A. People will all become short-sighted after they begin to go to school.

B. Playing outdoors for 2 or 3 hours every day can help protect your eyesight.

C. Children in Australia are more likely to get short-sighted than those in Singapore.

D. If you spend two or three hours playing outside each day, you won’t get short- sighted.

After a seaman is discharged，at the end of the voyage，the final payment of wages due must be made at the earlier of within 24 hours after the cargo has been discharged or______.

A.within 4 days after the seaman's discharge

B.prior to the vessel's departure on the next voyage

C.prior to loading any out-bound cargo

D.prior to any change of Master

The singer and ________ has arrived already.

A、 dancer

B、a dancer

C、the dancer

D、dancers

A.repeated

B.continual

C.continuous

D.unbroken

A、 where

B、 which

C、what

D、that

(A) has been raining

(B) rained

(C) was raining

(D) has rained

The external flotation bladder of an immersion suit should be inflated ______.

A.only after two hours in the water

B.only after four hours in the water

C.before entry into the water

D.upon entry into the water

After abandoning a vessel，water that is consumed within the first 24 hours will ______.

A.pass through the body with little absorbed by the system

B.help to prevent fatigue

C.quench thirst for only 2 hours

D.help to prevent seasickness