城市森林，是指在城市及其周边范围内以乔木为主体，达到一定的规模（面积应大于0.5hm2，hm表示百米）和覆盖度（林木树冠覆盖度应在10%～30%），能对周围的环境产生重要影响，并具有明显的生态价值和人文景观价值等的各种生物和非生物的综合体。
根据上述定义，下列不属于城市森林的是（ ）
贾女士：本报对减肥成功者所作的一项调查显示。70％的受调查者称服用东参减肥丸，30％的称服用灵芝瘦身丹。没有被调查者服用其它减肥药。
陈先生：这说明在被调查者中，服用东参减肥丸的人数，比服用灵芝瘦身丹的两倍还多。
贾女士：另外，25％的被调查者称他们从不通过药物减肥。
以下哪项如果为真，最有利于解释贾女土的断定中看来存在的矛盾?
【专题 GMAT逻辑题】
The higher the level of certainvitamins and minerals in the bloodstream, the better a person's lung function, asmeasured by the amount of air the person can expel in one second. The lung functionof smokers is significantly worse, on average, than that of nonsmokers. Clearly,therefore, one way for smokers to improve their lung function is for them to increasetheir intake of foods that are rich in these helpful vitamins and minerals. Which of the following is an assumption on whichthis argument depends?
(A) Smokers are less likely than nonsmokers to have diets thatare rich in vitamins and minerals.
(B) The lung function of smokers whose diets are rich in thosevitamins and minerals is generally better than that of nonsmokers with comparablediets.
(C) People whose diets are deficient in those vitamins and mineralsdo not typically have other health problems in addition to diminished lung function.
(D) Stopping smoking will not typically improve lung functionmore than any diet changes can.
(E) Smoking does not introduce into the body chemicals thatprevent the helpful vitamins and minerals from entering the bloodstream.
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