题干

有科学家指出,质子的半径比以前认为的要小4%。如果这个结论进一步得到证实,那就意味着,要么阐释光和物质相互作用的量子电动力学理论本身有问题,要么许多基于现有质子大小计算所使用的里德伯常量是错误的。不管是何种情况,都意味着我们需要重写基础物理理论。科学家在已形成结论的领域进行不断研究、反复论证,甚至改写相关理论体系,这说明(  )

①物理学上现已获得的真理性认识都是特定过程的产物,都是主观与客观具体的历史的统一

②物理学现有的真理都有其适用的条件和范围,都包含着谬误的成份

③真理和谬误相伴相长于物理学研究的全过程

④研究对象的无限性及其绝对运动的属性,决定了物理学任何研究成果都只是相对正确的

A:①③

B:①④

C:②③

D:②④

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A

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Why I Love Cycling

    One of the first things I did when I moved to a new city was hire a bike. Why?____ You travel much faster than on foot and you notice so much more of your surroundings than when in a bus or a car. It's more appealing to wander down small streets if they seem interesting, as you can quickly get back to the main road.

    Besides, I soon discovered plenty more benefits to cycling.

    A bike means that fewer places, especially in a small city like the one where I live now, feel far away. For example, cycling to work takes me half the time that it would to walk.____

    Of course, there are obvious health benefits of cycling—a bit of extra movement as part of your daily routine can help you keep fit and healthy. Cycling on my way to work also makes me feel more energetic in the mornings.

    ____ While cars pollute the environment, bikes are carbon-neutral. Furthermore, thanks to being petrol-free, bikes are cheaper to run, buy and fix than cars. Even if you don 'town a car, a bike can pay for itself when compared to the price of bus tickets.

    ____ Always wear a helmet, pay attention to other traffic and don't forget your lights at night. Make sure you know the road rules, especially in a new place. Some cities are more cycle-friendly than others.____ Luckily, where I live now is pretty easy to ride a bike around, thanks to having lots of cycle lanes and not too many hills!

A. However, be careful when cycling.

B. I have to learn to ride safely on the right of the road.

C. Importantly, cycling also helps to reduce your carbon footprint.

D. And sometimes city roads are difficult or unpleasant for cyclists.

E. Riding a bike also means you're not restricted by bus timetables.

F. Seeing a city by bike is ideal for settling in and learning your way around.

G. Cycling to work excellently fits for someone who wants to save their pocket money.