The phrase “on the latch” means the door is closed and locked.（）

There must be no one in the house ______ the door is closed.

A.because

B.as

C.for

D.since

The signal man assisting a crane operator has his arm extended with his fingers closed and thumb pointing upward．This is the signal to ______．

A.raise the boom

B.raise the hook

C.raise the boom and hook

D.check the boom stop

The underlined word "serene" in the last sentence is closed in meaning to______.

A．serious and grave

B．calm and peaceful

C．pleasant and friendly

D．cold and indifferent

"In our society the razor of necessity cuts close" in the first line means______.

A．there is a shortage of daily necessities

B．people fight each other for necessities

C．most people feel the financial pressure

D．everyone lives a hard life

By stating "I could have had my eyes closed" the author means (Line 7, Para. 3, last sentence) ______.

A．the third baseman would rather sleep than play the game

B．the author could close his eyes without watching the game, because it was always the same.

C．the third baseman is no good at baseball that he could finish the game with eyes closed all the time and do his work well

D．the consequence was too bad he could not bear to see it

What is the problem?

A．Susan Lam is not in her room.

B．The office is closed.

C．The caller gave the wrong name.

D．The man has lost his list.

The purpose of valve springs is to ( ).

A.keep valves close when the camshaft is not lifting the valve.

B.keep valves open

C.keep valve float

D.keep valves bounce

What is the view on the couple's cloning in the conversation?

A．Cloning is charming, and the couple should go on with it.

B．Cloning is still in discussion, so the couple may as well adopt a child.

C．There is no idea in the conversation.

D．Cloning must be stopped.