国外旅游，严禁从国外带水果等农产品，其原因是（  ）

若向量 $\overrightarrow{a}$ ， $\overrightarrow{b}$ 满足| $\overrightarrow{a}$ |= $\sqrt{3}$ ，| $\overrightarrow{b}$ |=2， $\overrightarrow{a}$ ⊥（ $\overrightarrow{a}$ ﹣ $\overrightarrow{b}$ ），则 $\overrightarrow{a}$ 与 $\overrightarrow{b}$ 的夹角为（   ）

    Winter is a beautiful season. My favourite season is winter. It's often snowy in many countries. And the outside is white. In winter, the days are shorter. And the nights are longer. It often gets dark very early. But I like snow, so I often go skiing(滑雪) on Sundays with my family. When it snows, everything turns white. There is thick snow on roads, streets, trees and houses. It's a beautiful world! My friends and I like making snowmen. Sometimes we play with snow. It's very interesting and exciting.

⑴Winter             ____         A. shorter.

⑵The days are       ____          B. like making snowmen.

⑶The nights are      ____         C. is snowy.

⑷My friends and I    ____         D. is interesting.

⑸Playing with snow  ____         E. longer.