Anincreasingnumberofmuseumstendtochargeadmissionfeesfromtouristsratherthanprovidingservicefreeofcharge.Doyouthinktheadvantagesoutweighthedisadvantages?

Thereissomanyrichpeopleinyourarea,tothemahighpricemeansagoodqualityproduct.

Whichoneisnotthefunctionsofthenonverbalcommunication;（）

TheWorldPopulationExplosion

Thereisamixtureofpeoplefromdifferentculturesandethnicgroupsinacountry.Why?Isthisapositiveornegativedevelopment?