已知反比例函数 的图象经过点M(2,1)
The car accident happened ____ a cold winter morning. Luckily, no one was hurt.
小明设计了一个魔术盒,当任意实数对(a,b)进入其中,会得到一个新的实数a2﹣2b+3,若将实数对(x,﹣2x)放入其中,得到一个新数为8,则x=____.
给玻片标本染色时,最合理的操作是( )
——What ____________ you _____________ last weekend?——I wrote some letters and read a book.