Which of the following are deductive arguments？
A: All dogs are mammals. All mammals have kidneys. Therefore all dogs have kidneys.
B: Since all squares are rectangles, and all rectangles have four sides, all squares have four sides.
C: All science teachers are smart, since all my physics teachers, chemistry teachers and biology teachers are smart.
D: The sun is a star; the sun has planets; therefore some stars have planets.
A: All dogs are mammals. All mammals have kidneys. Therefore all dogs have kidneys.
B: Since all squares are rectangles, and all rectangles have four sides, all squares have four sides.
C: All science teachers are smart, since all my physics teachers, chemistry teachers and biology teachers are smart.
D: The sun is a star; the sun has planets; therefore some stars have planets.
举一反三
- All mammals have hair, but notalways evident. A: but it is not B: but it is C: but they are not D: but they are
- It is common sense ______. A: that all we have to eat to live B: which we all have eaten to live C: that we all have to eat to live D: which we all have to eat to live
- Which of the following does not characterize Mercury A: nearest of all planets to the sun B: extremely hot C: little known to people D: biggest of all planets
- They have four children, all of _______ are now at school.
- ___to be checked and refuelled. ( ) A: All the aircrafts has B: All the aircrafts have C: All the aircraft has D: All aircraft must