【C4】A.take painsB.run riskC.take a riskD.make efforts
【C4】
A.take pains
B.run risk
C.take a risk
D.make efforts
【C4】
A.take pains
B.run risk
C.take a risk
D.make efforts
【C4】
A.Take an example
B.For instance
C.Take a case
D.As noted
【C4】
A.take care for
B.care of
C.take care of
D.be careful of
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.
【C1】
A.take
B.save
C.cost
D.waste
My father met my mother in a poker(纸牌)game. He couldnt【C1】______his eyes off her. It was her companys annual【C2】______, and he walked her home that night. The next week, from his home in Chicago, he【C3】______her a post card: "Remember me? Please【C4】______, because Ill be calling you one of these days. David". She still has that post card. Im not sure what made her【C5】______it. Though he already had his heart【C6】______her, she hadnt chosen him yet,【C7】______not consciously. As my father often told us【C8】______we were growing up, it was【C9】______luck that he was at the picnic that day. A salesman for a big electronics company, he was in town to【C10】______clients and happened to stop by the branch office that Saturday morning to【C11】______some calls. The telephone rang: it was the【C12】______of a local radio station with whom my father had done some business. So the mana-ger【C13】______my father to come right over to their annual picnic. My mother was a writer at that radio station. If my father hadnt【C14】______by the office that morning, he told us,【C15】______if hed gotten there two minutes later the life our lives would have been【C16】______. A few months after the wedding, my father was transferred east. They【C17】______in New York, in the house where I grew up. Sometimes I think about that, how time sweeps us【C18】______and puts us in a certain place where were faced with one choice or another. By chance or by the【C19】______we make, we leave behind whole other lives we could have lived, full of【C20】______passions and joys, different problems and disappointments.
【C1】
A.take
B.meet
C.fix
D.put
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