英语听力精选进阶版 15378（在线收听）

New research on the power of smiling

Grammar

a second

a very short period of time. There are 60 seconds in one minute

to make a good impression

to make people think well of you

grins

smiles

responses varied considerably

people reacted very differently

to avoid

not to do

enthusiast

person who is very positive and encouraging, who always looks on the bright side of things

have too much of a good thing

(fixed expression) it's possible that if you have something that you really like (a treat) too often, you'll eventually not enjoy it very much

fake

false, not true or genuine

lacking in warmth

not having very much friendliness and openness

floods

spreads, moves across