A: I once heard someone shout, “Look out.” I put my heard out of the window and a bucketful water fell on me. It seems that “Look out” may mean “Don’t look out”.
B: I was once on a ship and heard the captain shout, “All hands on deck(甲板).” I put my hands on the deck and someone walked on them.
C: I once called early on an English friend and the servant who came to the door said, “He’s not up yet. Come back in half an hour.” When I went again for him, she said, “He’s not down yet.” I said, “If he’s neither up nor down. Where is he?”
. In the dialogue the phrase “Look out” actually means “______”.

A．Don’t look out	B．Look out for the water
C．Be careful	D．Look everywhere

. The underlined word “them” in the dialogue means _______.

A．my feet

B．my hands

C．the ship

D．the deck

. “He is not up” and “He is not down” in the dialogue actually means     ______.

A．He doesn’t stand up and doesn’t lie down

B．He doesn’t come up and doesn’t go down

C．He hasn't turned up and hasn't turned down

D．He hasn't got up and he hasn't come downstairs

. The writer writes the dialogue to tell us that ______.

A．English is very interesting if you like it and keep on using it

B．it is impossible to learn English very well in a short time

C．language keeps on developing and changing all the time

D．words and phrases may have different meanings in different situations.