某电热器有两根电阻丝,只给一根通电,煮沸一壶水用的时间为t1;只给另一根通电,煮沸同样一壶水用的时间为t2.若两根电阻丝并连接到原来的电源上,煮沸同样一壶水需用的时间为t,则( )
They lost their way in the forest, and ___ made matters worse was that night began to fall.
Mrs. Panda will____(get) up at seven tomorrow.