【单选题】Tina was shopping on the street ______ it began to rain. [ ]
【简答题】Jeff has the ______ (习惯)of listening to music while reading.
【简答题】设X是距离空间, 是闭集。如果A是第二类型集,则A包含X中的某个闭球。
【单选题】---Tina, can I use your English dictionary for a short while ? ---___________. ____________.
A.
Yes, you can . Here are you !
C.
Yes , you can . Here you are !
【简答题】设{F k }是R n 中的非空闭集列,x 0 ∈R n ,若有 ,试证明 是闭集.
【判断题】举办单位是指拥有展会并对展会承担主要法律责任的办展单位。
【单选题】Tina _____ reading while her brother was listening to music. A. were B. was C. did