17、It____ Tom that parked the car here, as he is the only one with a car．

A．may be       B．can be       C．must have been         D．should have been

16、When the H1N1 virus____ at first in Mexico, no one had the least idea that it would spread so rapidly throughout the world．

A．broke off              B．broke down         C．broke out        D．broke away

15、Leaves are found on all kinds of trees, but they differ greatly_____ size and shape．

A．on          B．from                C．in             D．by

14、For breakfast, he only drinks juice from fresh fruit____ on his own farm．

A．grown         B．being grown          C．to be grown         D．to grow

13、She found her calculator _____ she lost it．

A．where       B．when        C．in which         D．that

12、Mary went to the box office at lunch time, but all the tickets____ out．

A．have sold            B．would sell            C．was selling         D．had sold

11、---Have we ________ food?．

--- Yes, ______．We’d better buy some．

A．run out of; we have run it out                     B．run out of; our food has run out

C．run out; our food has been run out               D．run out; our food has run out

10、Thank you for your help and I hope I can do something for you_____．

A．in return        B．in turn            C．in reply           D．by turns

9、I like this house with a beautiful garden in front, but I don’t have enough money to buy______．

A．one           B．it           C．this          D．that

8、Washoe is a young chimpanzee（黑猩猩）．She is no  1  chimpanzee, though．Scientists are doing a research  2 her．They want to see how civilized（驯化）she can  3 Already she does many things a human being can do．

For example, she has been learning how to exchange  4  with people．The scientists are teaching her  5  language．When she wants to be picked  6  , Washoe points up with one finger．She rubs her teeth with her finger  7  she wants to brush her teeth．This is done after every meal．

Washoe has also been  8  to think out and find answers to problems．Once she was put in a   9  with food hanging from the ceiling．It was too high to  10  ．After she considered the 11  she got a tall box to stand   12  The food was still too high to be reached．Washoe found a 13  pole．Then she climbed onto the  14  , grasped the pole, and   15  down the food with the pole．

Washoe   16   like a human, too．The scientists keep her in a fully furnished（家具齐全的）house．After a hard  17  in the laboratory, she goes home．   18 she plays with her toys．She   19  enjoys watching television before going to bed．

Scientists hope to   20  more about people by studying our closest, relative（亲属）-chimpanzee．

1．A．foolish                  B．ordinary             C．special                  D．simple

2．A．for                       B．by                     C．to                         D．on

3．A．experience             B．change              C．develop                 D．become

4．A．actions                  B．views                C．messages             D．feelings

5．A．sign                      B．human               C．spoken                  D．foreign

6．A．out                      B．at                      C．on                        D．up

7．A．when                   B．until                  C．since                    D．while

8．A．raised                   B．trained               C．ordered                 D．led

9．A．cave                     B．zoo                   C．room                    D．museum

10．A．pull                    B．see                    C．eat                       D．reach

11．A．problem              B．position             C．food                    D．ceiling

12．A．by                      B．on                     C．up                      D．with

13．A．straight             B．strong               C．long                      D．big

14．A．wall                    B．box                   C．ceiling                 D．pole

15．A．knocked              B．picked              C．took                     D．shook

16．A．lives                    B．acts                   C．thinks                 D．plays

17．A．task                   B．lesson                C．day                       D．time

18．A．Here                   B．There                C．So                        D．Then

19．A．quite                   B．already              C．even                     D．still

20．A．observe               B．discover            C．gain                      D．learn