Li Lei didn't meet the famous American professor ______ he was on holiday in America last

Li Lei didn't meet the famous American professor ______ he was on holiday last year.

A．unless

B．until

C．if

D．whether

Li Lei didn't meet the famous American professor ______ he was on holiday last year.

A．unless

B．until

C．if

D．whether

Li Lei didn't meet the famous American professor ______ he was on holiday last year.

A．unless

B．until

C．if

D．whether

Li Lei didn't meet the famous American professor ______ he was on holiday last year.

A．unless

B．until

C．if

D．whether

Why didn't Mr. White meet Mr. Li？

A．Because Mr. Li wouldn't like to meet Mr. White.

B．Because Mr. Li was not able to get here to meet Mr. White.

C．Because Mr. Li was on business.

Which is right？

A．Jim teaches Li Lei to throw the frisby up.

B．Jim teaches Li Lei to throw the frisby down.

C．Jim teaches Li Lei to throw the frisby like him.

Jim and Jim catches it. They don't see Li Lei come over. Jim throws the frisby. It flies to Li Lei. Jim is sorry. He asks Li Lei," Are you OK？" Li Lei says, "I'm fine. Please don't worry!" Li Lei plays with them, too. But Li Lei can't throw the frisby. He throws it up and down. Jim teaches him to throw it. Li Lei can throw it now. They all throw the frisby there.

It's time to ______ now.

A．go to school

B．go to bed

C．play games

What will professor Zhou do？

A．He will be away.

B．He is going to meet Li Li.

C．He is rude.

听力原文：M: Why didn't you have your astronomy class today？

W: Only five out of a class of twenty-five showed up. Since the professor had planned to present a complex demonstration, he decided to cancel the class until everybody could be present.

Q: Why didn't the astronomy class meet today？

(17)

A．The class thought the demonstration was too complex.

B．Too many students showed up.

C．The professor didn't show up.

D．The professor cancelled it.