气虚发热可选用（） A.丹栀逍遥散 B.归脾汤 C.补中益气汤 D.八珍汤 E.升阳

2011年3月10日，A公司通过互联网发布广告称其有一批优质木材出售，价格为每立方米3500元，并附有图片和规格。B公司见到后，即向A公司发出电子邮件，称如果价格能降低至每立方米2500元，愿意至少购买100立方米。A公司以电子邮件回复，可以商量，希望面谈。

2011年3月15日，B公司派人前往A公司洽谈，双方签订了买卖合同。合同约定：①B公司向A公司购买木材150立方米，每立方米3000元;②交货日期为2011年3月20日，交货地点为A公司仓库;③B公司于提货当日以汇票付款;④本合同自双方签字或者盖章时成立。A公司当即在该合同上盖章，B公司答应将合同带回公司盖章。

2011年3月20日，B公司按合同约定来到A公司提货，验货无误后，交给A公司一张D银行为付款人的汇票，但未经D银行承兑。B公司对此的解释是资金暂时周转不开，但是已经请C公司为该汇票提供保证。该汇票有C公司符合规定的签章，并注明“如果双方的合同出现纠纷，本公司不承担责任”。A公司了解C公司的实力，经与C公司联系情况属实，接受了该汇票。

2011年3月30日，A公司持B公司给付的汇票向D银行提示承兑被拒绝，理由是B公司的存款不足以支付票款。A公司找到B公司，要求支付票款被拒绝，B公司的理由是，A公司卖出的木材有一部分与合同约定的规格不符且A公司拒绝调换。A公司又要求C公司承担保证责任，C公司表示，本公司提供保证的条件是双方的合同不出现纠纷，所以拒绝承担保证责任。

2011年4月10日，A公司因急需支付一笔货款，将B公司给付的汇票背书转让给了E公司。

要求：

根据以上资料并结合法律规定，回答下列问题：

(1)A公司发布广告和B公司发出电子邮件的行为，哪一个属于要约?说明理由。

(2)A公司和B公司的买卖合同何时成立?说明理由。

(3)D银行作为付款人是否可以拒绝承兑该汇票?说明理由。

(4)B公司拒绝支付票款的理由是否合法?说明理由。

(5)C公司拒绝承担保证责任的理由是否合法?说明理由。

(6)A公司将汇票转让给E公司是否合法?说明理由。

阅读理解。

     Elephants and people are in competition for space. In much of Africa, elephants are now put in

national parks. Elephants suffered a serious and steady decrease in numbers in the 1970s. This wa

s the same time when scientists were beginning to learn a great deal about elephants and their behavior.

Studies through the 1980s and into the 1990s showed a lot about their sounds and methods of

communication.

     In Kenya alone, in the 1970s and 1980s, the elephant population decreased from 170,000 to

25,000. The sharp drop in numbers was the result of poachers (偷猎者) illegally killing elephants for

their ivory. The price of ivory went from $3 a pound to $50 to $100 a pound. Africa became very

attractive to poachers. Bull elephants carried the largest tusks (象牙), so they were more often killed.

With males gone and older females killed by poachers as well, there were many young elephants unable

to benefit from the wisdom of the older females and matriarchs, who lead the herds.

     Kenya took a stand, international trade in ivory was officially forbidden, and $3,000,000 worth of

confiscated (没收的) ivory was burned in Kenya. The following year, only 50 elephants were lost to

poachers in Kenya instead of 3,000. But Kenya has the fastest growing human population in the world.

People throughout Africa won't tolerate elephants eating their crops and destroying their livelihoods.

     In South Africa, elephants live behind the fences of national parks. In some parts of Africa, big-game

hunters pay a lot of money to hunt elephants. This keeps their numbers down, and the money goes toward conservation. In Kenya, there were some attempts at birth control to keep the elephant population at

manageable numbers to reduce conflicts with people.

     Faced with a growing human population, elephants are losing the battle for space. It's unlikely, though,

that they will become extinct. They will live in natural parks that bring tourists to Africa as well as India

and other parts of Asia. The money from tourism will help elephants to survive.

1. Bull elephants were at higher risk of being killed because _______.

A. they were the leaders of the herds

B. they possessed bigger ivory

C. they were of smaller size

D. they ran slowly

2. In the 1970s and 1980s, _______.

A. scientists learned little about elephants

B. most ivory was sold at a reasonable price

C. many young elephants are gaining less wisdom

D. the elephant population decreased because of the terrible climate

3. Some big-game hunters are still allowed to hunt elephants because _______.

A. elephants are eating their crops

B. they are pursuing fun instead of profit

C. the money they pay can be used to save elephants

D. they are not hunting in national parks

4. We know from the passage that in Kenya _______.

A. the human population is growing fast

B. it's likely that elephants will become extinct

C. confiscated ivory will be kept in national parks

D. no attempts were made to reduce elephants' conflicts with people

出入口控制系统中的常见身份识别种类中，下列哪个不是（）.

A、密码盘识别

B、生物识别

C、面部识别

D、射频卡识别

乘坐国内航班的旅客一律禁止随身携带（），但可办理交运。