Questions 31to 35are based on the following passage：
Cloning，manipulating a cell from an animal so that it grows into an exact copy of that animal，is the forbidden fruit of biotechnology． Some scientists were so sure it could not be done that，in the 1970s，they discouraged moralists（伦理学家）from discussing its moral implications．Yet at the same time other scientists，secretly，in out-of-the-way labs，were getting ever closer to making clones．For ten years，scientists have been cloning sheep and cows from embryo（胚胎）cells．But so far Dolly is the only animal cloned from an adult cell，not from an embryo． She is living proof that scientists have solved one of the most challenging problems of cell biology．
The question now is how soon will scientists clone humans．"Nature"，the scientific journal that published the Dolly paper，commented，"Cloning humans from adults tissues is likely to be achievable any time from one to ten years from now．"Most scientists agree there is no insurmountable obstacle in human cloning．But a human clone，even though it might resemble the individual from whom it was made，would differ dramatically in personality and character，intelligence and talents．"You will never get 100 percent identity，"says psychologist Jerome Kagan of Harvard，"because of chance factors and because environments are never exactly the same．"
That，however，is small comfort to many people．Shortly after Dolly's birth announcement，President Clinton ordered a group of experts to come up with proposals for government action．With the cloning of humans within reach，whether it is to be banned or regulated is now on the nation's moral agenda（议事日程）． Some regard the cloning of humans as inherently evil，a morally unjustifiable intrusion into human life．They measure the morality of any act by the intention behind it；still others are concerned primarily with consequences for society as well as for individuals．
For the moment it seems that the latest achievement in the biotech field has provided everyone with food for thought．
31．In what way is Dolly different from earlier clones？
A）It is cloned from human embryo．
B）It is cloned from a human cell．
C）It is cloned from an adult cell．
D）It is cloned from an adult embryo．
32．What is the prospect，according to most scientists，of making clones from adult human tissues？
A）Such clones will be exactly like the one from whom it was made．
B）It would be possible within the decade．
C）There still exist some technical problems．
D）It is impossible to make such clones in one to ten years from now．
33．Why did Clinton order a group of experts to make proposals for government action？
A）He wants to quicken the pace of cloning research．
B）The success of cloning involves serious moral evaluation problems．
C）He wants to ban the human cloning research．
D）He is worried about the funding of the further research．
34．"Food for thought"in the last paragraph means ________．
A）worry for food
B）increased food to be expected
C）something worthy of consideration
D）reasons for deep understanding
35．The best title for the selection can be ________．
A）BiotechnologicalSuccess And Its Possible Consequences
B）Dolly Is Only The Beginning
C）The Definition Of Cloning
D）Cloning Humans From Adults'Tissues
Questions 36to 40are based on the following passage：
Failure is probably the most fatiguing experience a person ever has．There is nothing more exhausting than not succeeding，being blocked，not moving ahead．It is an evil circle．Failure breeds fatigue，and fatigue makes it harder to get to work，which adds to the fatigue．