交叉场
参考答案：
径切面上射线薄壁组织细胞与轴向管胞相交的平面，又称“井字区”，一般指早材部分而言
根据句义，用括号中所给词的适当形式填空。
1. John and Mike ___________ kites near the river now. (fly)
2. It's expensive ____________ to other countries. (travel)
3. Jim _____________ not cook five years ago. (can)
4. The _____________ day of May is his birthday. (twelve)
5. He enjoys _____________ tricks on his friends. (play)
对羟福林的药理作用是（）
A.兴奋中枢
B.兴奋α受体
C.兴奋M受体
D.间接兴奋α、β受体
E.兴奋N受体
