铁路在弯道处的内外轨道高度是不同的，如图所示，已知内外轨道平面对水平面倾角为θ，弯道处的圆弧半径为R，在转弯时的速度为下列情况时，正确的是（   ）

如图分别为玉米、向日葵、葫芦藓、肾厥、油松、水绵六种植物，据图回答问题：

（1）在以上植物中，属于种子植物的是____ ；可以用孢子繁殖后代的植物是____ 　．

（2）B和E的种子相比，B最重要的特点是____ ．

（3）你能把以上植物所属的类群按从低等到高等的顺序排列吗？____ ．

（4）最小的分类单位是____ ．

读短文，判断正误。

Disneyland

   Would you like to see the whole world on one trip(旅行)? Welcome to the wonderful world of Disneyland. In Disneyland, you can see many different countries(国家) in one day. You can see people and buildings（建筑物） from every country. You can eat many different kinds of food in one day. There are restaurants from Australia, England, America, Japan and China.

  There is much to do in Disneyland. You can do a lot of shopping and buy many funny and beautiful gifts. You can see a mouse taller than you! His name is Mickey Mouse.