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问题 选择题

Bats are surprisingly long-lived creatures, some____________ a life span of around 20 years.

A．have

B．had

C．to have

D．having

答案

答案：D

本题考查独立主格结构。语意：真想不到，蝙蝠是长寿动物，有些蝙蝠的寿命长达20年。结合语意和句子结构可知此处为独立主格结构，having的逻辑主语是前面的some。

单项选择题

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.

（175）是（）

A.sickness

B.disease

C.viruses

D.germs
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单项选择题

10000kV变压器、电抗器施加电压前变压器油电气强度不小于（）。

A.40kV/2.5mm

B.50kV/2.5mm

C.60kV/2.5mm

D.70kV/2.5mm
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