水稻是亚洲主要的粮食作物，病虫害防治是保障其高产稳产的重要措施。完成问题。

小题1:实时监测和预报水稻病虫害灾情所运用的地理信息技术是          (　　)

A．全球定位系统、数字地球

B．遥感技术、地理信息系统

C．地理信息系统、数字地球

D．遥感技术、全球定位系统小题2:从某一时刻的遥感影像图中，不能获取的信息是                  (　　)

A．森林火灾面积

B．土地干旱程度

C．河流的洪峰流量

D．植物病虫害程度

Most IP layer-based proxy mechanisms，such as network address translation (NAT)，only supportuni-directional proxy，from the internal network to external network(the Interned．The proxvestablishes the communication channel by (71) IP addresses．The IP addresses must be (72) ．These proxy mechanisms prevent applications that must establish return data channels from establishing their data channels，such as，multimedia applications．IP layer-based proxy mechanisms need additional software (73) for each application that uses (74) channels． SOCKS identifies communication targets through domain names，overcoming the restriction of Usina private IP addresses．SOCKS can use domain names to establish communication between separate LANs，with (75) IP addresses．

A．routable

B．locatable

C．path-selected

D．road-defined