目前我国海关对首次拟报关注册者，实行注册前3个月备案实习管理制度，实习期间不得以报关

头尾律及向心律，反映了生长发育的（）

A.阶段性

B.渐进性

C.不平衡性

D.程序性

E.个体性

You might think that hamburgers were invented in the United States, but that is not totally true. These (1) , or patties, actually came from Germany in the middle of the nineteenth century. They were brought to the United States by (2) who came from the city of Hamburg. That is why (3) was "hamburger steak".

However, people in other places (4) that they invented the hamburger. Perhaps we’ll never have a (5) . But there’s no question that the hamburger was a (6) . Why Perhaps because at that time, industry was growing and a kind of (7) food was needed for workers.

The hamburger became even more popular (8) when the first chain of fast food restaurants was started. This chain was called "White Castle". It served tiny hamburgers that were sold for only (9) . Then, in the 1930s there came the (10) where customers were served in their cars by waiters in uniform. And the hamburger was one of the most (11) .

By now, The hamburger was ready to (12) the world. And this happened with McDonald’s, which was actually a (13) at first. But by the early 1950s the hot dog was replaced by the hamburger. McDonald’s and other fast food restaurants (14) around the world throughout the rest of the twentieth century. McDonald’s alone has (15) for everyone person in the world.

The importance of the hamburger to (16) remains significant. About (17) of all sandwiches that are eaten are hamburgers. According to some sources, (18) of current workers in the United States had their first job at McDonald’s. But the face of the hamburger is changing (19) . Nowadays it is possible to buy a chicken burger, a turkey burger, (20) , or veggie burger.

6（）

读下图，回答下列问题：

（1）图中C所在地区主要的经济作物有_________、__________、_________等。

（2）B国气候以________气候为主，该气候的特征是________________________。

（3）近年来，B国的________产业发展迅速，在世界上占有重要地位。

（4）中东地区的石油输出到A国经过的重要通道D是________，该通道位于________半岛与________岛之间，是十字路口的“咽喉”。

（5）C地多火山、地震，主要原因是__________________________________________。

（6）发源于B地区的宗教是________和_________。

中国将采取一系列法律、经济、行政及技术等手段，（），加强科技开发和研究能力，提高公众的气候变化意识，完善气候变化管理机制，努力实现应对气候变化国家方案提出的目标与任务。

A、节约能源

B、优化能源结构

C、改善生态环境

D、提高适应能力

各种类型水轮机的标称直径是如何规定的？