借款人应从()开始归还商业助学贷款。A.离校后半年 B.离校后一年 C.离校后次月

蝶式套利是两个跨期套利的互补平衡的组合。（）

某钢筋混凝土次梁，下部纵向钢筋配置为HRB400级钢筋，，混凝土强度等级为C30，f_t=1.43N/mm²，在施工现场检查时，发现某处采用绑扎搭接接头，其接头方式如图所示。试问，钢筋最小搭接长度l₁(mm)，应与下列何项数值最为接近().

A．846

B．992

C．1100

D．1283

肺癌的影像学检查方法多样，以下描述哪项是正确的（）

A.正侧位胸片是最基本的检查方法

B.CT扫描可以早期发现病变，显示病变的内部结构及细微表现，提高了诊断肺癌的准确性

C.MRI可作为CT的补充检查，对于肺尖、颈胸交界处等特定部位的病变能提供有价值的信息

D.FDG-PET能够提高纵膈内转移淋巴结的诊断准确率，并对肺原发病变的定性有一定帮助

E.超声检查应用受限

Our ape-men forefathers had no obvious natural weapons in the struggle for (1) in the open. They had neither the powerful teeth nor the p claws of the big cats. They could not (2) with the bear, whose strength, speed and claws (3) an impressive " small fire" weaponry. They could not even defend themselves (4) running swiftly like the horses, zebras or small animals. If the ape-men had attempted to compete on those terms in the open, they would have been (5) to failure and extinction. But they were (6) with enormous concealed advantages of a kind not possessed by any of their competitors.

In the search (7) the pickings of the forest, the ape-men had (8) efficient stereoscopic vision and a sense of color that the animals of the grasslands did not (9) . The ability to see clearly at close range permitted the ape-men to study practical problems in a way that lay far (10) the reach of the original inhabitants of the grassland. Good long-distance sight was (11) another matter. Lack of long-distance vision had not been a problem for forest-dwelling apes and monkeys because the (12) the viewpoint, the greater the range of sight-so (13) they had had to do was climb a tree. Out in the open, however, this simple solution was not (14) . Climbing a hill would have helped, but in many places the ground was flat. The ape-men (15) the only possible solution. They reared up as high as possible on their hind limbs and began to walk (16) . This vital change of physical position brought about considerable disadvantages. It was extremely unstable and it meant that the already slow ape-men became (17) still. (18) , they persevered and their bone structure gradually became (19) to the new, unstable position that (20) them the name Homo erectus, upright man.

17（）

A.faster

B.slower

C.more stable

D.safer

纵观当代世界，直接关系着全人类的前途命运，为当代国际社会所共同关注的两大主题是（）

A.和平和进步

B.稳定与发展

C.和平与发展

D.人口与环境