China represents a huge opportunity to America, so it’s important for Americans to know _______ the Chinese work and think and to make strong friendships and connections with Chinese people.

A．why

B．what

C．that

D．how

两伊战争的起因错综复杂，主要有

①领土争端②民族矛盾

③宗教矛盾④恐怖主义[ ]

A．①②③

B．①②④

C．②③④

D．①③④