函数y=tan(2x+π4)的定义域是______．

下列词语中有四个错别字，把它们分别找出来，然后把正确的字写出来。

人声顶沸　津津乐道　万事如意　水天相接

落日残霞　月残星疏　大言不惭　前扬后合

百无聊赖　肆意忘为　如法炮制　渚清沙白

风姿绰约　翩翩起舞　惴惴不安　衣衫蓝褛

_________　_________　_________　_________

此病的首选方为：

A．金匮肾气丸

B．当归芍药汤

C．补中益气汤

D．参苓白术散

E．温肺止流丹

阅读理解。

     Most people think of racing when they see greyhounds (灰狗) and believe they need lots of exercise.

They can actually be quite lazy! Greyhounds are good at fast races but not long-distance running. They do

need regular exercise but they like to run for a short burst and then get back on the bed or a comfortable

seat. Another misunderstanding is that greyhounds must be aggressive (好斗的) because they are big in size.

In fact greyhounds love people and are gentle with children.

     Greyhounds can live for 12-14 years but usually only race for two or three years, and after that they make

great pets. They don't need a lot of space, don' t make a lot of noise, and don't eat a lot for their size.

     Normally, greyhounds can be as tall as 90 cm. There is, however, a small-sized greyhound, which stands

only 33 cm. Greyhounds come in a variety of colors. Grey and yellowish-brown are the most common.

Others include black, white, blue, red and brown or a mix of these.

     Greyhounds have smooth body coats, low body fat and are very healthy. Because they' re slim (苗条的)

they don't have the leg problems like other dogs the same height. But they do feel the cold, especially since

they would much rather be at home in bed than walking around outside.

1. The text is written mainly _____.

A. to tell people how to raise greyhounds

B. to let people know more about greyhounds

C. to explain why greyhounds are aggressive

D. to describe greyhounds of different colors

2. It can be inferred that greyhounds _____.

A. love big doghouses

B. like staying in bed all day

C. make the best guard dogs

D. need some exercise outdoors

3. Why does the author say that greyhounds make great pets?

A. They are big in size.

B. They live a very long life.

C. They can run races for some time.

D. They are quiet and easy to look after.

4. If you keep a pet greyhound, it is important _____.

A. to keep it slim

B. to keep it warm

C. to take special care of its legs

D. to take it to animal doctors regularly

NAC’s (Network Access Control) role is to restrict network access to only compliant endpoints and (66) users. However, NAC is not a complete LAN (67) solution; additional proactive and (68) security measures must be implemented. Nevis is the first and only comprehensive LAN security solution that combines deep security processing of every packet at 10Gbps, ensuring a high level of security plus application availability and performance. Nevis integrates NAC as the first line of LAN security (69) . In addition to NAC, enterprises need to implement role-based network access control as well as critical proactive security measures—real-time, multilevel (70) inspection and microsecond threat containment.

（66）（）

A.automated

B.distinguished

C.authenticated

D.destructed

自然循环锅炉与强制循环锅炉水循环原理上区别？