下表为“部分国家和地区稀土储量、产量和消费量占世界百分比统计表”。据此完成小题。

①世界稀土资源的储量基数提高　②世界其他国家稀土资源的开采量增多　

③我国稀土资源的过度开采　   ④我国稀土资源消费量下降

A．①④　　　　　　　　

B．②④

C．①③

D．②③小题2:从可持续发展的角度看，我国在稀土资源开发利用方面应采取的合理措施是(　　)

①减少初级产品的出口　      ②针对稀土资源储量丰富的优势大力开采　

③对稀土资源进行保护性开采　④进一步扩大稀土资源在世界的出口份额

A．①③

B．②④

C．①④

D．②③

To compete in today’s fast-paced competitive environment, organizations are increasingly allowing contractors, partners, visitors and guests to access their internal enterprise networks. These users may connect to the network through wired ports in conference rooms or offices, or via wireless access points. In allowing this open access for third parties, LANs become (171) . Third parties can introduce risk in a variety of ways from connecting with an infected laptop to unauthorized access of network resources to (172) activity. For many organizations, however, the operational complexity and costs to ensure safe third party network access have been prohibitive. Fifty-two percent of surveyed CISOs state that they currently use a moat and castle’s security approach, and admit that defenses inside the perimeter are weak. Threats from internal users are also increasingly a cause for security concerns. Employees with malicious intent can launch (173) of service attacks or steal (174) information by snooping the network. As they access the corporate network, mobile and remote users inadvertently can infect the network with (175) and worms acquired from unprotected public networks. Hackers masquerading as internal users can take advantage of weak internal security to gain access to confidential information.

（173）是（）

A.denial

B.virtuous

C.complete

D.traverse