题干

2015年6月1日晚,“东方之星”客轮在长江水域监利段发生翻沉,客轮倒扣在江面上.为了尽快救出被困者,搜救队员用铁锤敲击露在水面的船体并将耳朵贴在船体上听.下列有关说法正确的是

A:敲击船体是为了使铁锤振动发声

B:敲击船体是利用声向被困者传递能量

C:贴在船体上听是为了听到求救的超声波信号

D: 贴在船体上听是利用固体传声效果比气体好

上一题 下一题 0.0难度 选择题 更新时间:2020-03-14 16:42:57

答案(点此获取答案解析)

D

同类题2

阅读理解

    It is made from grapes grown without pesticides (杀虫剂) and chemicals, is kind to the environment and rarely causes hangovers (酒后头痛). Sales of organic wine are booming in the UK.

    According to the organic food and farming group Soil Association, sales of organic beers, wines and spirits rose by 14.3% last year to reach nearly £6 million, driven by the demand from consumers who are increasingly seeking “natural” food.

    “It seems that people are rediscovering their link with the environment through organic food. Organic wines also taste better, perhaps due to less use of man-made chemicals.” said Finn Cottle of Soil Association. As well as the benefits of producing grapes without using pesticides, organic wine also contains less sulphur dioxide (二氧化硫), which can contribute towards hangovers.

    Supermarkets are increasing supplies on their shelves to meet consumer demand, while the switch to online shopping has also helped, as people are more easily able to find what they are looking for. Vintage Roots is now one of the UK's biggest online shops of organic wine, while Ocado provides more than 100 different organic wines and Daylesford, best-known for its organic vegetable boxes, has branched out into organic wine and spirits.

    The discount supermarket Aldi is set to start its first collection of so-called “green” wines this week, offering eight wines with organic certificates. Aldi expects the wines to appeal to the young shoppers who are increasingly concerned about the environmental influence of the produce that they are buying and consuming.

    English organic wine producer Oxney Estate's Noir Rosé recently won the Waitrose prize for the most outstanding rosé wine at the competition. A spokeswoman for Waitrose said: “Organic wine is a growing trend globally and we have seen sales increase by 16% in the last year”.

根据短文内容,选择最佳答案,并将选定答案的字母标号填在题前括号内。