help! Another two question!

sap1000 · 发表于 2003-10-26 23:13:00

22. All intelligent people are nearsighted. I am very nearsighted. So I must be a genius.

Which one of the following exhibits both of the logical flaws exhibited in the argument above?

(A) I must be stupid because all intelligent people are nearsighted and I have perfect eyesight.

(B) All chickens have beaks. This bird has a beak. So this bird must be a chicken.

(C) All pigs have four legs, but this spider has eight legs. So this spider must be twice as big as any pig.

(D) John is extremely happy, so he must be extremely tall because all tall people are happy.

(E) All geniuses are very nearsighted. I must be very nearsighted since I am a genius.

20. Normal full-term babies are all born with certain instinctive reflexes that disappear by the age of two months. Because this three-month-old baby exhibits these reflexes, this baby is not a normal full-term baby.

Which one of the following has a logical structure most like that of the argument above?

(A) Because carbon dioxide turns limewater milky and this gas is oxygen, it will not turn limewater milky.

(B) Because no ape can talk and Suzy is an ape, Suzy cannot talk.

(C) Because humans are social animals and Henry is sociable, Henry is normal.

(D) Because opossums have abdominal pouches and this animal lacks any such pouch, this animal is not an opossum.

(E) Because some types of trees shed their leaves annually and this tree has not shed its leaves, it is not normal.

The answers are all D ,I don't get this kind of logic question.Please do me a favor,tell me the reason.Thanks!

dorbear · 发表于 2003-10-27 03:01:00

[face=Verdana]

22. All intelligent people are nearsighted. I am very nearsighted. So I must be a genius.

Which one of the following exhibits both of the logical flaws exhibited in the argument above?

(A) I must be stupid because all intelligent people are nearsighted and I have perfect eyesight.

(B) All chickens have beaks. This bird has a beak. So this bird must be a chicken.

(C) All pigs have four legs, but this spider has eight legs. So this spider must be twice as big as any pig.

(D) John is extremely happy, so he must be extremely tall because all tall people are happy.

(E) All geniuses are very nearsighted. I must be very nearsighted since I am a genius.

The argument contains three parts:
（1）. "All intelligent people are nearsighted."
（2）. The affirmation of the consequence of （1）. (上面的逆命题)
"I am nearsighted, so I am Intelligent."
（3）. Pick up the extremity of the consequence of (2)
"I am very nearsighed, so I am the top of the Intelligent, the genius."

Follow this pattern, you will see (D) will be the one.[/face]

sap1000 · 发表于 2003-10-27 05:17:00

Thanks a lot!

help! Another two question!

help! Another two question!

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