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
2024-09-24
24
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] 【C9】
选项
A、Meanwhile
B、Hence
C、Therefore
D、However
答案
D
解析
空前讲的是从岩石中开凿的运河两边的堤岸几乎是垂直的,空后讲的是土质堤岸的运河如果两边太陡峭就会导致坍塌,两句之间应是转折关系,故答案为[D]However。[A]Meanwhile“与此同时”;[B]Hence“因此”;[C]Therefore“因此,所以”。
转载请注明原文地址:https://tihaiku.com/zcyy/3771535.html
相关试题推荐
Today,mostcountriesintheworldhavecanals.Somecanals,suchastheSue
Today,mostcountriesintheworldhavecanals.Somecanals,suchastheSue
Today,mostcountriesintheworldhavecanals.Somecanals,suchastheSue
Today,mostcountriesintheworldhavecanals.Somecanals,suchastheSue
Today,mostcountriesintheworldhavecanals.Somecanals,suchastheSue
Today,mostcountriesintheworldhavecanals.Somecanals,suchastheSue
Today,mostcountriesintheworldhavecanals.Somecanals,suchastheSue
Today,mostcountriesintheworldhavecanals.Somecanals,suchastheSue
Today,mostcountriesintheworldhavecanals.Somecanals,suchastheSue
Today,mostcountriesintheworldhavecanals.Somecanals,suchastheSue
随机试题
Soon___________(有一个新的发展)thathadfar-reachingeffects.cameanewdevelopment
Foryears,mentalhealthprofessionalsweretrainedtoseechildrenasmere
ClassifythefollowingdescriptionsasreferringtoAPRTonlyBRUFonlyCboth
Hellenisfondoflightmusic,______herbrotheriskeenonrockandroll.A、when
根据税务行政复议的有关规定,对被撤销的税务机关在撤销以前所作出的具体行政行为不服
5人有相应的5个指纹档案,每个指纹档案上都记录有相应人的指纹痕迹,并有检测指示灯
在生产多产品的企业中,下列可能会影响企业总边际贡献率的因素有()。
一般来说,旅游景区人才危机主要表现在()等方面。A.景区人才特别是高级管理
每个月的10号,是H村村民翘首以盼的日子。这一天,不需要干部召集,村民们会准时从
下列说法中正确的包括()。 (A)分心会削弱说服效果 (B)预警会促
最新回复
(
0
)