皮皮学,免费搜题
登录
logo - 刷刷题
搜题
【单选题】
Part Ⅱ Reading Comprehension (Skimming and Scanning) Directions: In this part, you will have 15 minutes to go over the passage quickly and answer the questions on Answer sheet 1. For questions 1-7, choose the best answer from the four choices marked A), B), C)and D). For questions 8-10, complete the sentences with the information given in the passage. What's the right activity for me? Whoever you are. there's an activity for you. And just as getting fitter doesn't have to mean pushing yourself to the limits of your endurance, you don't have to be technically brilliant at a particular sport to derive pleasure and health benefits from it. Some people hold back from getting fit because they feel self-conscious about their ability or body and want to find an activity they can do on their own, but organized classes and sports clubs can provide you with support and motivation, as well as a chance to make new friends. If you're interested in football, hockey or other team sports, for example, many local clubs will have several teams of varying abilities, while there are plenty of aerobics or yoga classes specifically designed to cater for beginners. You're never too old to learn to swim, or you can take classes to improve your technique if that's what's holding you back. But many activities can be done by yourself, and require neither technical expertise nor much in the way of equipment or expense just your willingness togive it a go. Here are some of the best, easiest and most popular ways to start getting fit, as well as some suggestions for alternatives, that get you started or put you in touch with a local club. Walking Most of us walk at some point each day but we do it far less than we used to. The government calculates there's been a decline of more than 20 percent in the number of miles walked since the mid-1980s. But walking is the simplest and cheapest of all exercises, and making it a regular activity and focusing on the intensity or distance covered can greatly increase your fitness. Walking improves the condition of your heart and lungs and works the muscles of the lower body. It's a weight-bearing activity, so it may improve bone density, yet it's also low impact, putting less stress on the joints than some other forms of exercise. Aside from the health benefits of walking, some of the country's most beautiful scenery can only be accessed on foot, so if you don't try walking, think what you're denying yourself. If you're a novice, go in groups or as part of an organized outing via a ramblers club. Walking up hills expends more energy--even walking down again uses more energy than walking on the flat, but if you don't think you're ready for the hills yet, boost your fitness by walking just about anywhere. You could try power walking in the park. For example: the idea is to walk at such a fast pace that it would actually be easier to break into a run. You burn more calories walking at this speed than you would running at the same pace. Running/jogging Running might just be the ultimate way to get fit: it's cheap, can be done anywhere, at any time and, most importantly, is very effective. There's really no difference between running and jogging, although jogging is often used to describe running at a slow pace. Whatever you call it, all you need is a good pair of running shoes and a little enthusiasm. As long as you're healthy and take it easy to start with, anyone can run. If you have a history of certain diseases like chest pain, high blood pressure, or have had recent surgery or are pregnant, consult a doctor first. As a high-impact activity, running may maintain or increase bone density. But
A.
Offering readers information about sports activities.
B.
Persuading readers to try cheap ways of exercise.
C.
Attracting potential athletes to register for sports events.
D.
Asking people to donate in order to develop public sports.
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
微信内点击右上角“…”即可分享
反馈
参考答案:
举一反三
【单选题】工艺技术规程中装置平面布置图,必须标出设备、仪表明细,就是将设备、仪表进行分类列表,注明( )规格型号、主要设计性能等参数。
A.
名称和代号
B.
能耗指标
C.
污染物产生及排放控制指标;
D.
前述三项
【多选题】关于镜头相对孔径下列表述正确的是:
A.
相对孔径标志着镜头的通光能力, 相对孔径值等于入射光瞳直径与镜头焦距之比,以d/f表示。
B.
相对孔径值越大,镜头的通光能力越强,成像越亮。
C.
镜头所能达到的最大相对孔径又叫有效孔径 , 有效孔径值用1∶f/D表示 。
D.
镜头的有效孔径值一般标识在镜头前圈上,体现了该镜头的最大通光能力。有效孔径的分母值越大,镜头最大通光能力越强。
【单选题】镜头的通光量F是镜头()。
A.
通光孔径和焦距之比,F值越大,则光圈越大
B.
通光孔径和焦距之比,F值越小,则光圈越大
C.
焦距和通光孔径之比,F值越大,则光圈越大
D.
焦距和通光孔径之比,F值越小,则光圈越大
【判断题】镜头的孔径越大,光圈值越大。
A.
正确
B.
错误
【单选题】下列关于数码相机光圈与快门的叙述,错误的是()。
A.
光圈的大小决定了光线穿过镜头的强弱
B.
光圈的f值数值越小,光圈的孔径就越大,进光量就越多
C.
数码相机的B门是比T门曝光时间更长的控制装置
D.
快门速度实质是时间概念而不是速度概念
【多选题】关于镜头相对孔径下列表述正确的是:
A.
相对孔径标志着镜头的通光能力, 相对孔径值等于入射光瞳直径与镜头焦距之比,以d/f表示。
B.
相对孔径值越大,镜头的通光能力越强,成像越亮。
C.
镜头的有效孔径值一般标识在镜头前圈上,体现了该镜头的最大通光能力。有效孔径的分母值越大,镜头最大通光能力越强。
D.
镜头所能达到的最大相对孔径又叫有效孔径 , 有效孔径值用1∶f/D表示 。
【单选题】中国的现代旅游业起始于20世纪( )年代。
A.
50
B.
80
C.
60
D.
90
【判断题】镜头的通光量F是镜头焦距和通光孔径之比,F值越小,则光圈越大。
A.
正确
B.
错误
【判断题】中国的现代旅游业起始于20世纪50年代,迅速发展于20世纪80年代,全面发展于20世纪90年代。
A.
正确
B.
错误
【单选题】F8:光圈值为2.8。光圈是照相机上用来控制镜孔径大小的部件,用以控制( )、( )以及( )。常见的光圈值有F1、F1.4、F2、F2.8、F4、F5.6、F8、F11、F16、F22、F32、F44、F64。光圈F值越( ),在同一单位时间内的进光量便越( ),上一级的进光量刚好是下一级的( )。
A.
景深 镜头成像质素 拍摄进光量 小 多 两倍
B.
景深 ISO 快门 大 多 两倍
相关题目:
参考解析:
知识点:
题目纠错 0
发布
创建自己的小题库 - 刷刷题