下列物质属于共价化合物的是（ ） A．H2SO4 B．KOH C．NaHCO3

如图所示，两个质量相同的物体A和B，在同一高度处，A物体自由落下，B物体沿光滑斜面下滑，则它们到达地面时(空气阻力不计)

A．动能相同，速度相同。

B．A、B两物体在运动过程中机械能都守恒。

C．B物体的速率大，动能也大。

D．B物体重力所做的功比A物体重力所做的功多。

资本化率构成中，流动性补偿的流动性是指( )。

A．房地产开发企业自有资金周转的速度
B．估价对象房地产变为现金的速度
C．估价对象房地产带来净收益的速度
D．房地产开发企业流资金周转的速度

补充宿主：

Are you interested in seeing the beautiful fall foliage of New England but tired of traffic jams and overbooked hotels Then this year forget the crowds in New England and see the beautiful colors of autumn in the Catskills.
These rugged mountains in New York State, just 90 miles northwest of New York City, are famous for the legendary tales of Rip Van Winkle, and more recently for the summer hotels mat sprang up in the region during the 1940s, 1950s, and 1960s. Families trying to escape the heat of New York City found the Catskills to be the perfect place to stay for a month or so each summer. By the late 1950s there were over 500 resorts and hotels offering nighttime entertainment as well as all kinds of outdoor activities. Famous comedies like Jackie Gleason, Joan Rivers, and Sid Caesar all got their start touring the hotel clubs here. Since the introduction of air-conditioning and cheaper air travel, however, families have stopped coming to the Catskills in such large numbers, chasing instead more distant locations at different times of the year. Many of the Catskills hotels closed in the 1970s, but some remain and have expanded and changed their facilities to meet the needs of today’s visitors.
Currently, there are many activities available to the traveler besides witnessing the changing colors of the leaves. There is an all-organic sheep farm where visitors can see how a traditional sheep farm operates. There are also hundreds of miles of scenic drives in the area. Route 42, for instance, is an excellent site for spotting bald eagles. For more information on vacations in the Catskills, call the office of Public Information.

From the passage, what might a visitor be lucky enough to do

A. See fall leaves in color.
B. See a kind of bird.
C. Work on a sheep farm.
D. Drive on scenic roads.