Today is Saturday. The weather is warm and sunny. Bob and Jack go to the park. There are many people there. The girl under a big tree is reading a book. Two boys are playing football on the grass. The girl in a red dress is riding a bike. Two women are talking. The man beside these women is playing with a baby. Bob and Jack are beside the river. They are sitting on the chair and drawing pictures.

⑴It's warm and sunny ____       A. are beside the river.

⑵There are many people ____    B. are talking.

⑶Two boys ____                 C. in the park.

⑷Two women ____              D. are playing football on the grass.

⑸Bob and Jack ____             E. on Saturday.

下列为生物进化提供有力证据的中间过渡类型生物化石是（    ）

在“测量未知定值电阻R_x的阻值”实验中，请回答如下问题：

小红把若干个长24厘米、宽18厘米的长方形拼成一个大正方形，正方形的边长至少是____厘米；若把这个长方形裁剪成若干个大小相等的小正方形，小正方形的面积最大是____平方厘米。