某城市的电话号码，由六位升为七位（首位数字均不为零），则该城市可增加的电话部数是

下列有关关税处理的表述中，不正确的是（）

A．租赁方式进口的货物中，以租金方式对外支付的租赁货物，在租赁期间以海关审定的租金作为完税价格

B．对留购的租赁货物，以海关审定的留购价格作为完税价格

C．租赁方式进口的货物中，承租人申请一次性缴纳税款的，经海关同意，按照一般进口货物估价办法的规定估定完税价格

D．分期支付租金的租赁进口货物，分期付税时，应按该项货物原进口之日实施的税率征收关税

主承销即牵头组织承销团的证券公司。主承销可以( )。

A．由证券监督机构与证券公司协商确定

B．由注册资金最多的证券公司担任

C．由证券发行人按照公平竞争的原则，通过竞标的方式产生

D．由证券监督机构指定

食品的微生物污染，一方面对食用者造成危害，一方面降低了（）。

A.食品价格

B.食品的卫生质量

C.食品的可食用性

D.食品的外观质量

E.食品的形状

各级卫生监督人员，只有开展卫生行政监督执法活动时必须按照规定统一着卫生监督服装，并按规定佩戴肩章、胸牌。

The Theory of Continental Drift has had a long and turbulent history since it was first proposed by Alfred Wegener in 1910. (46) Vigorously challenged yet widely ignored, the theory had languished for half a century, primarily due to its lack of a plausible mechanism to support the proposed drift. With the discovery of sea-floor spreading in the late 1950’s and early 60’s, the idea was reinvigorated. Plate tectonics is now almost universally accepted. Many details of the mechanism are to be worked out.

The surface of the Earth is divided into approximately six large plates, plus a number of smaller ones. The plates are’ bounded by an interconnected network of ridges, transform faults, and trenches. Ridges, also called spreading centers, occur where two plates are moving away from each Other. As the plates separate, hot molten mantle material flows up to fill the void. (47) The increased heat resulting from this flow reduces the density of the plates, causing them to float higher, thus elevating the boundaries by many thousands of feet above the colder surrounding sea floor. (48) Ridges on the ocean floor form the longest continuous ranges of mountains on the planet, but. only in a very few places on the Earth do these mountains rise above the ocean surface.

New sea floor is constantly being created along spreading centers. Obviously somewhere else old sea floor must be going away. This occurs in trenches, also called subduction zones. Trenches occur along the boundary between two plates that are moving towards each other. (49) Where this occurs, one plate is bent downwards at about a 400 angle and plunges under the other plate’s leading edge, eventually to melt back into the liquid mantle below. As the subducting plate is heated back up to mantle temperatures, certain minerals in the plate melt sooner than others. (50) Minerals that melt at lower temperatures and are lighter than the surrounding material tend to rise, melting their way up through the overriding plate to erupt as volcanoes on the ocean floor. As these volcanoes grow, they rise above the ocean surface to form lines of islands along the leading edge of the overriding plate. Numerous islands of Micronesia and Melanesia in the western Pacific were created in this way.

(49) Where this occurs, one plate is bent downwards at about a 400 angle and plunges under the other plate’s leading edge, eventually to melt back into the liquid mantle below