根据《水利水电工程标准施工招标文件》，提交履约担保证件系（）的主要义务和责任。A.质

食管癌患者出现声音嘶哑，说明肿瘤已侵及（）。

A.迷走神经

B.声带

C.气管隆嵴

D.喉返神经

E.喉上神经

李民为一农村青年，2012年大学毕业后工作一直没有着落，就随同乡一起加入了去北京打工的行列。2012年9月他们一行16人来到京望建筑集团，成为一位农民工。到2013年12月，临近新年，他们一行人欲返乡过年，向老板讨要工钱。老板一直以各种理由拖欠不给，使他们一行人生活陷入困境。请回答下列问题。

如果李民一行人向法院提起了诉讼，要求京望集团尽快支付劳动报酬及迟延支付给他们造成的损失。对于该争议的举证，下列说法正确的是：（）

A.李民一行应就与京望存在劳动关系和欠薪数额举证

B.李民一行无须举证，由京望集团举证

C.李民一行如果主张工资记录由京望集团第三项目部保管，则京望集团应当提供该证据

D.如果与争议有关的证据属于京望掌握，则京望拒不提供应承担不利后果

一般杂货船装载少量固体散货时，应（）。

Ⅰ.装于大舱；Ⅱ.与怕气味货分舱室装载；Ⅲ.可用草席隔票；Ⅳ.污水井应用透水材料加以封盖。

A．Ⅰ，Ⅳ

B．Ⅰ，Ⅱ

C．Ⅰ，Ⅱ，Ⅲ

D．Ⅰ，Ⅱ，Ⅲ，Ⅳ

El Nino is the term used for the period when sea surface temperatures are above normal off the South American coast along the equatorial Pacific, sometimes called the Earth’s heartbeat, and is a dramatic but mysterious climate system that periodically rages across the Pacific.

El Nino means "the little boy" or "the Christ child" in Spanish, and is so called because its warm current is felt along coastal Peru and Ecuador around Christmas. But the local warming is just part of an intricate set of changes in the ocean and atmosphere across the tropical Pacific, which covers a third of the Earth’s circumference. Its intensity is such that it affects temperatures, storm tracks and rainfall around the world.

Droughts in Africa and Australia, tropical storms in the Pacific, torrential rains along the Californian coast and lush greening of Peruvian deserts have all been ascribed to the whim of EI Nino. Until recently it has been returning about every three to five years. But recently it has become more frequent--for the first time on record it has returned for a fourth consecutive year--and at the same time a giant pool of unusually warm water has settled down in the middle of the Pacific and is showing no signs of moving.

Climatologists don’t yet know why, though some are saying these aberrations may signal a worldwide change in climate. The problem is that nobody really seems sure what causes the El Nin o to start up, and what makes some per than others. And this makes it particularly hard to explain why it has suddenly started behaving so differently.

In the absence of EI Nino and its cold counterpart, La Nina, conditions in the tropical eastern Pacific are the opposite of those in the west. the east is cool and dry, while the west is hot and wet. In the east, it’s the winds and currents that keep things cool. It works like this. Strong, steady winds, called trade winds, blowing west across the Pacific drag the surface water along with them. The varying influence of the Earth’s rotation at different latitudes, known as the Coriolis effect, causes these surface winds and water to veer towards the poles, north in the northern hemisphere and south in the southern hemisphere. The surface water is replaced by colder water from deeper in the ocean in a process known as upwelling.

The cold surface water in turn chills the air above it. This cold dense air cannot rise high enough for water vapor to condense into clouds. The dense air creates an area of high pressure so that the atmosphere over the equatorial eastern Pacific is essentially devoid of rainfall.

The writer begins the text with（）

A. a description of a scene

B. a root cause of EI Nino

C. a narrative of an event

D. a definition of EI Nino

新生儿的面部表情在很大程度上是反射性，随着年龄的增长表情日益丰富。