简述雌激素的生理机能。

质量为0.5kg的物体静止在水平面上，受到一个大小为3N的水平拉力F作用后开始运动，运动中所受滑动摩擦阻力为2N，此拉力F作用力2s后，其大小变为1N而方向不变，继续拉物体运动，直到物体停止在水平面上．求

（1）物体在改变拉力大小后，还能运动多长时间？

（2）物体总位移为多大？

（3）全过程中拉力F对物体所做的总功？

（4）拉力F的最大功率为多大？

ARIZONA

Thunderbird Lodge in Canyon de Chelly

A one-night stay at the historic lodge starts at $59 for a single room and the lodge offers half-day tours of Canyon de Chelly ($41 for adults and $32 for children aged 12 and under)

Time: May. 31, 2009 ～ Nov. 1, 2009

Details: Hotel taxes are an additional 17.1 percent

Contact: 800/679-2473, tbirdlodge.com

CALIFORNIA

Zephyr Cove Resort at Lake Tahoe

A three-night stay in a lakeside cabin(小木屋) for two people, an Emerald Bay sightseeing for two, free breakfast and lunch. Rates are $299 per couple --- saving of up to $400.

Details: Hotel taxes are included

Time: Through Dec.15, 2009

Contact: 800/234-8946, zephyrcove.com

NEVADA

Montelago Village at Lake Las Vegas

A one-night stay at the Mediterranean-stlye MontelLago Village, 17 miles from Las Vegas. Rates start at $65 per person including ice-skating fees and skate rentals.

Details: Hotel taxes are an additional 12 percent

Time: Nov. 17, 2009 ～ Jan. 15, 2010

Contact: 866/399-2753, monteLagovillage.com

YELLOWSTONE

Mammoth Hot Springs Hotel

A two-night stay, breakfast daily, full-day ski rental, unlimited ice-skating and skates and a book of Yellowstone photos. Rates start at $119 per person. A one-night stay at the hotel starts at $65.

Time: Jan.1, 2010 ～ May.2, 2010

Details: Hotel taxes are an additional 8 percent

Contact: 866/439-2473, travelyellowstone.com

56. 小题1:If a couple and their 14-year-old son want to have a half-day tour of Canyon de Chelly on Oct.13, 2009, they should pay _______.

A．$114

B．$123

C．$177

D．$18957. 小题2:If you are interested in ice-skating, you may find more information in _______.

A．tbirdlodge.com and zephyrcove. com

B．monteLagovillage.com and tbirdlodge.com

C．zephyrcove.com and travelyellowstone.com

D．travelyellowstone.com and monteLagovillage.com58. 小题3:If you have a holiday in December, and intend to stay in a European-stlye hotel, you may go to _______.

A．Mammoth Hot Springs Hotel

B．Zephyr Cove Resort at Lake Tahoe

C．Montelago Village at Lake Las Vegas

D．Thunderbird Lodge in Canyon de Chelly59. 小题4:You needn’t pay extra fees as hotel taxes if you stay in _______.

A．Mammoth Hot Springs Hotel

B．Zephyr Cove Resort at Lake Tahoe

C．Montelago Village at Lake Las Vegas

D．Thunderbird Lodge in Canyon de Chelly

肝硬化腹壁静脉曲张，静脉血流回流方向为（）

A.脐上腹壁静脉血流向上回流，脐下的静脉向下回流

B.脐上腹壁静脉血流向上回流，脐下的静脉向上回流

C.脐上腹壁静脉血流向下回流，脐下的静脉向下回流

D.脐上腹壁静脉血流向下回流，脐下的静脉向上回流

E.脐上腹壁静脉血流向左右回流，脐下的静脉向上回流

男性，30岁，10年来阵发性心悸，每次心悸突然发作，持续半小时至3小时不等，此次发作持续半小时而来就诊。检查：血压90/60mmHg，心率200次／分，心律绝对规则，无杂音，肺（-）。

估计此次心律失常最可能的是（）

A.2：1心房扑动

B.阵发性室性心动过速

C.窦性心动过速

D.阵发性室上性心动过速

E.心房纤颤

下列各项属于王夫之立法思想的有（）。

A.立法应遵循尊君卑臣、分权分治的原则

B.立法"必循天下之公"

C.立法应以"保类卫群"为宗旨

D.立法必须体现"以天下为主"