生命起源的研究是世界性科技领域的一大课题，科学家认为生命起源的第一层次是产生了与

Due to climate change, Arctic ice is breaking up earlier in the spring, and its area is decreasing. This is creating problems for polar bears that make their homes off northern Alaska and in Hudson Bay.

Polar bears off Alaska normally hunt and raise their young on ice sheets that float on the ocean. But as the ice has melted, the polar bears have been forced to spend more time on land. There, they have begun to frequent beaches, feeding on the remains of whales caught by native hunters. For polar bears, this food is less nutritious than seals that they normally catch on ice sheets. The shrinking（减少） ice has also forced more polar bears into the ocean. In the past, they only had to swim short distances between ice sheets. But as the ice has shrunk, polar bears have been forced to swim longer and longer distances in the open ocean. This poses a severe danger during rough weather, and an increasing number of drowned polar bears have been observed.

In Hudson Bay, the ice breaks up three weeks earlier in the spring now than it did 20 years ago. Polar bears on Hudson Bay fast（绝食） during the summer, waiting for ice to form in the fall to hunt. Every year, the summer gets longer, and the bears get skinnier. Over the past 25 years, the average weight of the female bears has dropped 68 kg. This loss affects their ability to reproduce, and already the number of births has dropped 15 percent. Unless the bears can learn to survive these climate changes, these giants of the ice may one day disappear.

小题1:What is Arctic ice doing earlier each year?

A．It’s freezing.

B．It’s hardening.

C．It’s melting.

D．It’s expanding.小题2:What is true of polar bears that are spending more time on land in Alaska?

A．Their young are dying.

B．Their diet is changing.

C．Their health is improving.

D．Their families are growing.小题3:What do polar bears in Hudson Bay do during the summer?

A．They claim territory(地域).

B．They protect mates.

C．They hunt animals.

D．They stop feeding小题4:In which publication would you most likely find this passage?

A．Medical News

B．Society Today

C．Wildlife Journal

D．Design Magazine

某购房人从银行贷款50万元，贷款期限10年，按月等额还本付息，贷款年利率6％，每月计息一次，其每月应向银行还款的数额为（）元。

A.4917

B.5551

C.7462

D.7581

新制度经济学的主要代表人物有（）、科斯的穆塞尔德姆塞茨、舒尔茨、（），以及林毅夫等。

提高灰铸铁耐磨性应选用（）

A、整体淬火

B、渗碳+淬火+低温回火

C、表面淬火

D、等温淬火

对外提供合并财务报表时，下列有关关联方披露的提法中，正确的是：

A．仅披露与合并范围外的各关联方之间的关系

B．仅披露本年度发生关联方交易的关联方关系

C．应当披露所有的关联方关系

D．由企业根据重要性原则，选择需要披露的关联方关系