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物理原理在日常生活中被广泛运用，给人们带来很大的便利，例如杠杆原理。下列工具运用了杠杆原理的有（ ）。
A.筷子
B.扳手
C.撬棍
D.指甲刀
共用题干
Mind Those Manners on the Subway
So,there you are,just sitting there in the subway car,enjoying that book you just bought ______(46) Or , the person sitting next to you takes out a nail clipper（指甲刀）and begins cutting his or her nails.
Annoying? Many of us have to spend some time every day on public transportation.
______(47)So,to make the trip more pleasant,we suggest the following:
Let passengers get off the bus or subway car before you can get on.______(48)
Stand away from the doors when they are closing.
Don't talk loudly on a bus or subway.Chatting loudly with your friends can be annoying to others.______(49)
Don't think your bags and suitcases（手提箱）deserve a seat of their own.
Use a tissue whenever you cough or sneeze（打喷嚏）.An uncovered sneeze can spread germs （细菌）, especially in crowded places.
Don't cut your nails or pick your nose on public transportation. Don't read over other people's shoulder.______(50)It can make people uncomfortable.They might think you're too stingy （小气的）even to buy a newspaper. Or they might think you're judging their behavior.
______(49)
A: Don't eat food in your car.
B: Don't shout into your mobile phone on a bus or subway.
C: We all know that some behaviors are simply unacceptable.
D: Many people do this on subways,but it's really annoying.
E: Getting off and on in an orderly manner can save time for all.
F: Suddenly,you feel someone leaning over your shoulder reading along with you.
Mind Those Manners on the Subway
So,there you are,just sitting there in the subway car,enjoying that book you just bought ______(46) Or , the person sitting next to you takes out a nail clipper（指甲刀）and begins cutting his or her nails.
Annoying? Many of us have to spend some time every day on public transportation.
______(47)So,to make the trip more pleasant,we suggest the following:
Let passengers get off the bus or subway car before you can get on.______(48)
Stand away from the doors when they are closing.
Don't talk loudly on a bus or subway.Chatting loudly with your friends can be annoying to others.______(49)
Don't think your bags and suitcases（手提箱）deserve a seat of their own.
Use a tissue whenever you cough or sneeze（打喷嚏）.An uncovered sneeze can spread germs （细菌）, especially in crowded places.
Don't cut your nails or pick your nose on public transportation. Don't read over other people's shoulder.______(50)It can make people uncomfortable.They might think you're too stingy （小气的）even to buy a newspaper. Or they might think you're judging their behavior.
______(49)
A: Don't eat food in your car.
B: Don't shout into your mobile phone on a bus or subway.
C: We all know that some behaviors are simply unacceptable.
D: Many people do this on subways,but it's really annoying.
E: Getting off and on in an orderly manner can save time for all.
F: Suddenly,you feel someone leaning over your shoulder reading along with you.