首页
登录
职称英语
Today, most countries in the world have canals. Some canals, such as the Sue
Today, most countries in the world have canals. Some canals, such as the Sue
游客
2023-09-03
1
管理
问题
Today, most countries in the world have canals. Some canals, such as the Suez or the Panama,【C1】______ ships weeks of time by making their voyage a thousand miles shorter. Other canals permit boats to reach cities that are not located on the coast.【C2】______ other canals drain lands where there is too much water, help or【C3】______ fields where there is not enough water.
The【C4】______ of a canal depends on the kind of boats going through it. The canal must be wide enough to permit two of the【C5】______ boats using it to【C6】______ each other easily. It must be deep enough to leave about two feet of water【C7】______ the keel of the largest boat using the canal.
Some canals have sloping sides, while others have sides that are nearly【C8】______ Canals that are cut through rock can have nearly Vertical sides.【C9】______ , canals with earth banks may【C10】______ if the angle of their sides is too steep. Some canals are lined with brick, stone, or concrete to keep the water【C11】______ soaking into the mud. This also permits ships to go at【C12】______ speeds, since they cannot make the banks fall in by【C13】______ up the water. In small canals with mud banks, ships and barges (大平底船) must【C14】______ their speed.
When the canal goes【C15】______ different levels of water, the ships must be【C16】______ or lowered from one level to the other. This is generally done by【C17】______ of locks. If a ship wants to go Up to higher water, the lower end of the lock opens to let the boat in. Then this gate closes, and the water is let into the lock chamber from the upper level. This raised the level of the water in the lock 【C18】______ it is the same as the upper level of water. Now the upper gates can be opened to【C19】______ the ship into the higher water. Sometimes a canal contains a series of locks when the【C20】______ in levels is very great. [br] 【C8】
选项
A、flat
B、straight
C、vertical
D、horizontal
答案
C
解析
从while一词可知,所填词与前面的sloping形成对比,因此应该填与sloping意义相对的词,故答案为Cvertical“垂直的”。Aflat“平坦的”;Bstraight“笔直的”;Dhorizontal“水平的”。
转载请注明原文地址:https://www.tihaiku.com/zcyy/2982423.html
相关试题推荐
Insomecountries,attendanceinthepublicschoolsis______untilagesixteen.A
Thosewho______armedinterventionintheinternalaffairsofothercountriesa
Ahealthyeconomyseems__________withgovernmentmonopolyinanycountries.A、i
Relationsbetweenthetwocountrieshave______sincetheagreementwassigned.A、
[originaltext]Amongwesternrichcountries,peopleintheUnitedStateswor
[originaltext]Amongwesternrichcountries,peopleintheUnitedStateswor
[originaltext]Amongwesternrichcountries,peopleintheUnitedStateswor
[originaltext]Amongwesternrichcountries,peopleintheUnitedStateswor
Relationsbetweenthecountrieswereformally______in1997.A、mechanizedB、norm
Relationsbetweenthecountrieswereformally______in1997.A、mechanizedB、norm
随机试题
[originaltext]Goodmorning,everybody.Intoday’slecture,wewilltalkabo
WhileSteve________hiscar,he________somedentsonthedoors.A、washed;hasdisc
EverySundaymorningmillionsofIndianssettledownwithacupofteaandt
假定上述税率表是超额累进税率表,第三级的速算扣除数是()A.500元
下列炊具中使维生素C损失得最多的是( )。A.铝锅 B.铜锅 C.
简论张居正改革。
Intemet上最基本的通信协议是FTP。( )
糖尿病、高血压伴有肾功不全者最好选用A.哌唑嗪 B.胍乙啶 C.卡托普利
小儿在何月龄克氏征阳性是正常的A.生后1~2周 B.生后1~2个月 C.生后
关于妊娠期高血压疾病,以下哪项不正确A.病情控制良好的孕妇,可经阴道分娩 B.
最新回复
(
0
)