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分析如下的JavaScript代码段,并写出运行后的结果。var num = 10;function fn(){num = 20;alert(num)}alert(num)

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SectionD-1Volunteersareourheartandsoul.Pleasecomeandhelpusbuildhomesfor_1_low-incomefamilies.Thereisnoexperienceneededandwesupplythe2.Justvolunteerforaday.It’sfun,rewardingandyoucanlearnsome3.Ifbuildingisn’tyourthing,comeandvolunteerforoneofoureventsor4.Youmustbe514yearsofagetovolunteerandthose15yearsandundermustcomewithaparent.Comeandsignupnowtovolunteeryourtime.

冲泡时间过长，茶多酚渗出物多，导致茶汤（）

A. 涩
B. 鲜
C. 甜
D. 甘

嫩芽可用高温水冲泡。（）

A. 对
B. 错

松散型的茶叶比紧压型的茶汁容易浸出，所以浸泡时间不宜过长。（）

A. 对
B. 错