下列有关柏拉图的叙述中不正确的是(　　)

雾霾的主要成因是PM2．5的排放，即大气中直径小于或等于2．5微米的颗粒物，也称可入肺颗粒物。下图为天津市某年四季PM2．5平均日变化分布图。读图回答下面小题。

    It is generally believed that obesity is a global epidemic and crisis. But people's view on weight is keeping us from doing things to help us get ____ healthy body. Obesity researchers hate____ when I say this, but their own data shows that obesity is not going to kill us. Most obese people don't have ____(short) lifespans (寿命) than non-obese people and in fact it's the underweight people ____ are at most at risk.

    So why does everybody think obesity is deadly? One reason is that obesity is associated with three different things that ____(be) deadly and lead to shorter lifespan: being sedentary (久坐);____ (have) lower income; and not getting enough medical care. Everyone, the medial the medical community operate from the firm ____ (assume) that obesity is deadly. So any evidences contradicting that are ignored. It is true that obese people are more likely ____(get) diabetes and cardiovascular disease. But there are two things you need to realize. First of all, the obesity paradox. When obese people get the ____ (disease), they're less likely to die of them than non-obese people. Second, to reduce the risks that you may suffer from, you don't ____ (actual) have to get thin. You just need to exercise.

    Camberwell College Swimming Pools

    Camberwell College of Arts has one 50m (Olympic sized) pool with a depth of 2m throughout, and one 25m pool with a 1m shallow end and a 4m deep end. Both pools may be used by the general public at certain times.

    50m Pool

    The pool is often used for classes, but the general public may use two lanes（泳道）for lane swimming at the following times.

    Monday:        06:30-11:30 and 19:00-21:00

    Tuesday:        06:30-11:30 and 18:00-21:00

    Wednesday:    06:30-13:30 and 17:30-21:30

    Thursday:    06:30-13:30

    Friday:        06:30-13:30

    Weekends:    09:00-17:00

    Children under the age of 14 must be accompanied by an adult.

    Please note that during College holidays, these times will be different. Call 04837 393560 for up-to-date information.

    25m Pool

    The 25m pool is available for recreational (non-lane) swimming from 07:00-09:00 and 12:30-13:30 on weekdays, and 10:00-16:00 on Saturdays.

    Children aged 12 and under must be accompanied.

    We regret that the 25m pool will be closed for redecoration between 21st July and 18th August. The men's changing rooms will be closed for the week beginning 19th August, and the women's changing rooms will be closed the following week. Alternative（可选用的）changing rooms will be made available. We're sorry for this.