不符合胰岛增生的描述是（） A.可发生于各年龄组 B.出现自发性低血糖 C.胰岛数量

The bus was held up by the snowstorm, thus________the delay. [ ]

A. to cause  

B. having caused

C. causing  

D. caused

如图所示电路，当开关S₁闭合时电流表示数是0.3A，当开关S₁ S₂都闭合时电流表示数是0.5A。问：

（1）当S₁ S₂都闭合时，灯泡L₁ L₂是如何连接的？

（2）当S₁ S₂都闭合时，通过灯泡L₂的电流是多少A?

女，17岁，疲乏无力，心烦易怒，怕热多汗半年，易饿，体重下降11公斤，月经量减少，经期仅1-2天，查体：P140／70mmHg，皮肤微潮，手有细颤，轻微突眼，甲状腺一度弥漫性肿大，质软，无触痛

该患者最可能的诊断是（）。

A.亚急性甲状腺炎

B.graves病

C.单纯性甲状腺肿

D.自主神经功能紊乱

E.糖尿病

公平交易要求( )。

A．投资者现金流出的现值大于现金流入的现值

B．投资者现金流出的现值等于现金流入的现值

C．该投资行为所产生的现金流的净现值大于零

D．该投资行为所产生的现金流的净现值等于零

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.

It can be inferred that when EI Nino and La Nina occurs simultaneously,（）

A. the Coriolis effect may bring trade winds to the poles

B. the atmosphere in the Pacific will be cool and dry

C. the conditions in the eastern Pacific would be hot and wet

D. the cold vapor will rise high enough to make for rainfall