22、Scientists who study         noise say that         average noise level in New York is 72.5 decibels.

A．不填；the B．不填；an  C．the; an      D．a; the

21、Children’s brains cannot develop       they lack protein (蛋白质).

A．since                          B．when                  C．because               D．unless

20、Tom’s teacher kept on telling him that he should read English every day, but      didn’t work.

A．he                              B．which                 C．it                        D．all

19、Recent research       that people who don’t sleep well will easily get ill.

A．showed                      B．has shown           C．will show            D．is showing

18、Unexpectedly,         his stepping out of the taxi he was arrested by two policemen.

A．on                             B．about                  C．in                       D．at

17、When       help, one often says “Thank you” or “It’s kind of you.”

A．offered     B．offering    C．to be offered    D．to offer

16、Although the country has had political independence for over a century,        it needs the support of its neighbors.

A．naturally   B．economically    C．especially  D．luckily

15、These countries will join one another against terrorism,        was agreed to at the international conference.

A．that                            B．who                    C．as                       D．what

14、--- Henry doesn’t seem like the same person.

----         so much in life has made him more thoughtful.

A．To see      B．His seeing C．Seen  D．To be seeing

13、Research findings show people spend about two hours dreaming every night, no matter what they          have done during the day.

A．should      B．would       C．may D．must