如图，利用一面墙（墙的长度不限），另三边用20m长的篱笆围成一个积为50m2的矩形场地，求矩形的长和宽各是多少．
冬天，教室若长时间不开门窗，很多同学会感到头晕，注意力不集中，这是因为教室里（ ）
The girl is too young. She can't ________ herself now.
⑴how tall are you？____
⑵what did you do last Monday？____
⑶what are they going to buy？____
⑷how heavy are you？____
⑸where did you go the day before yesterday？____
A. I did my homework and read books.
B. I'm 55 kilograms.
C. I'm 1.66 metres.
D. I went to the theater the day before yesterday.
E. They are going to buy some foods and fruits.
