小题1: What is necessary to know when we speak English besides using grammar?

A．Introduction.

B．The culture.

C．Grammar.

D．Topics.小题2: "When speaking to a stranger, ask them where they are from and then make a connection (联系) with that place" can be used as a sentence to_______.

A．speak about location

B．talk about sports

C．address people

D．talk about work小题3: We can learn from the text that_______.

A．Americans shake hands when greeting same sex friends

B．different sex friends should hold hands when first meeting

C．when you speak to others, it's polite to look into their eyes

D．smoking is not allowed in the modem United Sates小题4: What would be the best title for the text?

A．American English Tips.

B．Language Differences.

C．The Different Language Culture.

D．American Customs.

简述两段锁协议的含义。