信息农业
参考答案：在信息经济条件下，农业基础设施装备信息化、农业技术操作自动化、农业经营管理网络化。
The comments the expert made _____ stock market bothered Bill greatly, _____ him sleepless all night.[ ]
A. concerning; making
B. be concerning; which made
C. concerned; made
D. to be concerning; made
重力的方向可利用如图所示的装置来研究．实验中发现，随着β的改变，α也跟着改变，并总是相等．据此可知，重力方向总是________，用来检查墙壁砌得是否竖直的________就是根据这一原理制成的．重力的施力物体是________．
