When introducing people in a business or more formal social situation, you should introduce a younger person to an elder person.（）

When most people refer to multimedia, they generally mean the combination of two or more continuous media, usually with some user(115). In practice, the two media are normally audio and video, this is,(116)plus moving(117).It should be' obvious by now that transmitting multimedia material in uncompressed form. is completely out of(118). The only hope is that massive compression is possible. Fortunately, a large body of research over the past few decades has led to many compression techniques and algorithms that make multimedia transmission(119).

A．display

B．games

C．help

D．interaction

E．pictures

When someone gives you some more food, but you don't want any more, then you should say"______"

A．Please

B．No, thanks

C．Fine, thank you

When underway in a channel，you should if safe and practicable ().

A.stay near the middle of the channel

B.keep to the starboard side of any vessels you meet

C.exchange whistle signals with any other vessels in the channel

D.keep to the side of the channel which lies to your starboard

When underway in a channel，you should keep to the ().

A.Middle of the channel

B.Starboard side of the channel

C.Port side of the channel

D.Side of the channel that has the widest turns

When you walk in a busy street, you should walk on the side ______.

A．where the wind is coming

B．where the wind is going

C．where the wind is weaker

D．where the wind is stronger

When checking the liquid level in a tank, you should position yourself _____.

A.on the windward side of the opening

B.on the leeward side of the opening

C.at a right angle to the wind direction

D.so that the obstruction of your body will protect you from the fumes

When hugging a bank in a narrow channel，you should take precautions against ______．

A.Bank suction，squat and the effects of vessels passing close aboard

B.Clogged sea chests，plugged sea strainers and overheated machinery

C.Striking underwater obstructions close to the bank

D.All of the above