家禽的消化器官由（）、（）、（）、（）、嗉囊、胃、肠道以及泄殖腔组成。

采用汇总或合并申报缴纳企业所得税的外商投资企业，向主管税务机关提交有关税务资料的期限是( )。

A．3月31日前

B．4月1日前

C．4月30日前

D．5月31日前

如图所示，半径为r =10cm的圆形匀强磁场区域边界跟y轴相切于坐标原点O，磁感应强度为B=0.332T，方向垂直纸面向里。在O处有一放射源，可沿纸面向各个方向射出速率为v="3.2" ×10⁶m/s的带正电粒子，已知该粒子的质量m="6.64" ×10^-27kg,电量为q="3.2" ×10^-19C。不计重力。（12分）

（1）沿半径OC方向射出的粒子，穿过磁场时方向偏转角度θ是多大？

（2）在磁场中运动时间最长的粒子运动时间是多少？

A new study shows one of the largest glaciers(冰川) in Greenland is becoming smaller and speeding to the sea faster than scientists expected. If it continues, Greenland itself could become much smaller during this century and global seas could rise as much as 3 feet.

The rates of change that we’re noticing are much higher than expected. If these rates continue, it is not likely that Greenland could shrink by several tens of percent this century. However, it’s not known how quickly this coastal response of the Greenland ice sheet melting will have an effect on the vast inland ice.

Greenland is the world’s largest island, covering area more than three times the size of Texas. Some 81 percent of it is covered by ice, and there are many glaciers. Glaciers are like slow-moving rivers of ice. Where a glacier meets the sea, its weight keeps it firmly resting on the bottom. A glacier’s front is the point where the water is deep enough that the glacier floats.

Since the 1970s, the front of Helheim stayed in the same place. Then it began melting rapidly, moving back 4.5 miles from 2001 through this past summer. It has also grown thinner, from top to bottom, by more than 130 feet since 2001. And over these past years, its trip to the sea has sped up from about 70 feet per day to nearly 110.

The melting is driven by a warmer climate. Temperatures in Greenland have risen more than five degrees Fahrenheit(华氏温度) in the last ten years. Since most of Greenland’s ice is on land, seas will rise as the ice melts. If all Greenland’s ice sheet melted, oceans would be 15-20 feet higher. Nobody expects that to happen any time soon.

小题1:What can we know about the glaciers according to the passage?

A．Glaciers only lie in Greenland.

B．Water in glaciers is more than sea water.

C．Glaciers sometimes float on the water.

D．Glaciers can increase the water level of lakes.小题2:According to the passage, we know that Greenland ___________.

A．belongs to Canada

B．is the largest island in North America

C．is all covered with glaciers

D．is sinking under the sea level小题3:Which of the following may be the result of the disappearing of Greenland glaciers?

A．The climate of the world will be warmer.

B．The glaciers in other areas will be bigger.

C．It will be easy for explorers to visit the island.

D．Some coastal cities may be under the sea.

门静脉高压症的声像图表现特点，下列不正确的是（）。

A.肠系膜上静脉增宽

B.附脐静脉开放

C.脾静脉增宽

D.肝静脉增宽

E.胃左静脉增宽

芭蕾进入剧场的开始的标志是（）。

A.《皇后喜剧芭蕾》

B.《红色娘子军》

C.《波莫娜》

D.《仙女》