[单项选择]When a dog has received effective obedience training, its owner______.
A. can give the dog more rewards
B. will enjoy a better family life
C. can give the dog more freedom
D. will have more confidence in himself

[单项选择]When a dog has received effective obedience training, its owner ______.
A. can give the dog more rewards
B. will enjoy a better family life
C. can give the dog more freedom
D. will have more confidence in himself

[单项选择]

The dog has always been considered man’ s best friend. Always noted for being particularly faithful in watching over children, he also has his place by the fireside, in the cow pasture, on the sheep range(放牧区), and beside the hunter in forest. He is easy to train, works hard, and often performs astonishing feats. And in the frozen polar regions he was once the principal motive power, before being lately displaced by the plane and helicopter. Because he howls or whines in the presence of impending death, the dog was once thought to have supernatural powers and believed to be capable of seeing gods and ghosts invisible to men. Actually, the basis for these beliefs lies in the hound’ s sensibility to people’ s feelings and his superior hearing ability and sense of smell, which enable him to detect signs hidden from human observation. His record of saving lives is outstanding, for he often gives warning of fire and other dangers not noticed by his master. The dog&rs
A. carried supplies
B. provided companionship
C. tracked prey
D. herded caribou(驯鹿)

[单项选择]The dog has been of most value to man in the development of ______.
A. a treatment for rabies
B. open-heart surgery
C. a cure for distemper
D. Both A and C

[单项选择]The dog has always been noted for ______.
A. protecting children
B. assisting shepherds
C. helping hunters
D. herding cattle

[单项选择]As has always been the case when tragedy has struck our community, the people of our town feel the obligation, and rightly so, to ------- in support of the victim and his family.
A. (A) entrench
B. (B) rally
C. (C) disseminate
D. (D) convoke
E. (E) apologize

[多项选择]Which two states are the port states when RSTP has converged?（）
A. blocking
B. learning
C. discarding
D. forwarding
E. listening

[单项选择]26 When Bob has caught a few fish, he cooks them and eats them.

[单项选择]A baby who ______ when young has the better chance of growing up successfully.
A. talks to
B. is talked to
C. was talked about
D. has talked

[单项选择]Only when he has lost his way ______ that he wasn' t careful enough to make sure that he really did understand.
A. he realize
B. he can realize
C. he has realized
D. does he realize

[单项选择]When has the heart-open surgery been possible
A. Only in the last fifty years.
B. From prehistoric times.
C. Since the nineteenth century.
D. Since the invention of values.