暴发类型不包括（）。 A.同源暴发 B.连续传播性流行 C.混合型 D.

A rare provision in San Francisco’s business tax code that taxes companies when employees cash in their stock options has caused a stir in this hotbed of fledgling tech companies. Remarkably, few companies even knew about the tax, which has been in effect for seven years. But since city officials offered Twitter a payroll-tax break as an incentive for it to remain in San Francisco (the company is considered likely to go public soon), the stock-option provision has suddenly come under intense scrutiny. A number of other booming companies, including Zings, the maker of online games and one of the city’s fastest-growing firms, have threatened to leave the city unless they receive similar payroll-tax exemptions before going public.

Unlike most cities, San Francisco generates most of its business tax revenue through a payroll tax. The Twitter exemption bill, which will be considered by the full Board of Supervisors on April 5, would freeze payroll taxes for six years along a strip of Market Street—where Twitter is set to relocate—and several square blocks in the Tenderloin neighborhood. Twitter executives had been concerned because since 2004 the city’s payroll tax code has counted stock options granted to employees as compensation, which is taxed at 1.5 percent. If Twitter goes public in San Francisco and a large number of workers exercise their options, the city would tax the company on its employees’ stock gains—a bill likely to amount to tens of millions of dollars. "Twitter could be looking at a significantly larger payroll tax liability if and when it goes public," said Ted Egan, the chief economist in San Francisco’s controller’s office.

Because of the dearth of I. P. O. ’s inside the city limits in the last decade, the stockoption tax has gone under radar until now. Businesses, city officials and even seasoned tax lawyers are confounded. "Nobody ever talked about this because nobody’s really tested these issues before," said Thomas H. Steele, a partner in Morrison & Foerster’s San Francisco office, specializing in state and local tax. He said that his clients began calling him this week to ask about the tax’s ramifications. "A Pandora’s box has already been opened," said Supervisor Ross Mirkarimi, a member of the Board of Supervisors’ budget and finance committee, who has expressed concern about tailoring legislation for one company. "We’ve been going about this the wrong way," he said. The recent confusion has added impetus to calls for comprehensive business tax reform by David Chiu, the board president. "The stock option problem is real," Mr. Chiu said. "We have to address it in a fair and responsible way.

According to the first paragragh,we know（）

A. there are many high tech companies in San Francisco

B. payroll-tax break is unreasonable

C. other companies are jealous of Twitter

D. city officials offered tax-free for listed companies

肾厥叶态优美，易于种植，常被人们作为观赏植物来栽培。下列措施最有利于盆栽肾厥生长的是（ ）

A．放在背阴处，多浇水

B．放在向阳处，多浇水

C．放在背阴处，少浇水

D．放在向阳处，少浇水

（1）决定有机物的化学特性的原子或原子团叫做________，醇的官能团是_______(填名称) ，羧酸的官能团是_______(填结构简式) 。

（2）现有九种有机物：① 乙醇 ② 甲苯 ③ 苯酚 ④ 甘油 ⑤ 甲烷 ⑥ 甲醛 ⑦ 甲酸 ⑧ 乙烯 ⑨ 乙炔，将序号填入下列相应的空格中：

可以作为制取炸药原料的是________（至少写一种）；常温下能与溴水发生取代反应的是_________；与溴水发生加成反应的是___________．

氢氧化钠（钾）致皮肤、黏膜外伤时，外涂（）

A．氧化镁、甘油（1：2）糊剂

B．羊毛脂

C．5%～10%硼酸软膏

D．5%硫代硫酸钠软膏

E．5%～10%鞣酸软膏

肥胖病人心影呈（）

A.滴状心

B.横位心

C.靴形心

D.主动脉型心

E.梨形心