证券交易的特征主要表现为( )。 A．流动性、收益性和风险性 B．流动性、安全性和

下列各句中，没有语病且句意明确的一句是( )。

A．科学工作者需要开阔的心胸，就是和自己学术观点不一样的同行也应坦诚相待，精诚合作。

B．健康休闲是一种以恢复身心健康状态、丰富生活、完善自我为目的的闲暇活动。

C．曾记否，我与你认识的时候，还是个十来岁的少年，纯真无瑕，充满幻想。

D．上海音乐厅精心打造的“五一”晚会，奉献给观众的俨然是一桌名家荟萃、名曲云集的文化大餐。

C

An oasis (绿洲) is an island of life in an ocean of temperature extremes．Any oasis always contains one or more springs Oases make it possible to survive through the desert．In large deserts such as the Sahara．towns are located around sources of water such as oases and rivers．

What causes an oasis? An oasis is actually a spot in the desert where the altitude is low enough that the water table is fight below the surface，resulting in the presence of springs．Even in a desert, it rains occasionally，and this produces a water table just above the bedrock，usually several hundred feet below the surface．Sand is very porous (可渗透的)，so most water runs right

through it and down to the bedrock．

Deserts consist of many millions of tons of sand．There is only one natural force capable of moving it in noticeable amounts：the wind．Although，in an average dust storm，ten cubic feet of air only holds about an ounce of sand，a cubic mile of air can move about 4,600 tons of it，leading to erosion (侵蚀)．A severe storm is capable of moving as much as 100 million tons of sand and dust．

In certain areas where large quantities of sand are moved by storms，erosion digs all the way down to the water table，putting it just beneath the surface Seeds planted in the ground there are capable of extending roots into the moist land，producing an oasis．

Sometimes．the oasis produced by the wind can be very large when vast tracts of desert are wiped clean by storms．The great Kharga oasis in the Sahara，for example，is over 100 miles long and 12 to 50 miles in width. The oasis was produced when erosion caused the edges of the hollow places to sink down to the water table.    

63．What does “it” in Paragraph 4 refer to_______．

A．erosion        B．water table          C．sand                      D．storm

64．How many conditions of the oasis formation are mentioned in the passage without considering

The wind and seeds?

A．3                B．4                        C．5                           D．6

65．We can infer from the passage ________．

A．there is at least one spring on an oasis

B．the bedrock is usually just right below the surface

C．the great Kharga oasis is the biggest oasis in the world

D．the great Kharga oasis is at a low altitude

66．In the last paragraph，the author mentions the great Kharga oasis as an example to_______．

A．introduce the great oasis to the readers

B．tell how the oasis was produced by rain

C．show the oasis produced by the wind can be very large

D．tell it’s easy to form oases in the desert after storms

关于烧伤后的营养治疗原则描述错误的是（）。

A.烧伤后的治疗应该紧密结合临床病程进行

B.在感染期要以利尿、消炎和解毒为主，尽量给予高维生素膳食，改善负氮平衡

C.在休克期要以消炎、利尿、清热、解毒为主，尽量促进食欲，提供足够的蛋白质和能量

D.在休克期可以提供米汤、牛奶等食物，少量多餐

E.在康复期给予高蛋白、高能量、高维生素和矿物质丰富的全面膳食，加强营养，保证机体康复

若某项目净现值为零，则表明项目（）。

A．盈利能力为行业的最低水平

B．盈亏平衡

C．盈利能力刚好达到行业的平均水平

D．利润为零

破坏电力设施以何种罪判处何期限的徒刑？