21. Birds have higher maximum lifespans than mammals (哺乳动物) and are less prone ____ death in the wild.
举一反三
- It is said that ____birds are better fed, more healthy, and live longer than their fellows in the wild.
- According to the passage, scientists have discovered that influenza viruses ______ . A: cause ill health in wild birds B: do not always cause symptoms in birds C: are rarely present in wild birds D: change when transferred from animals to man
- 3. What is the finding of the study? A: Female elephants born in the zoo die much earlier than those in the wild. B: Wild female Asian elephants live longer than their African counterparts. C: Most wild elephants were killed by predators instead of dying of natural causes. D: Baby elephants raised in the zoo are less likely to suffer from natural diseases.
- The correct statement about the bidding quotation is (). A: The bid price shall be lower than the market value of cost price, and lower than the social average cost price. B: The quotation can not be lower than the cost, but can be higher than the maximum bid price. C: If the quotation is lower than the cost, the bid evaluation committee shall reject the bid. D: The quotation can be lower than the cost, but not higher than the maximum bid price.
- Blood loss from a large (动脉，要道）can lead to death in less than a minute。