人类社会发展与能源的利用息息相关，能源可分为“可再生能源”和“不可再生能源”，可

患儿，男性，2岁，因腹部包块超声检查示左上腹巨大实性肿块，边界尚清，回声不均，见不规则的透声区，与肾脏关系密切，其上残存肾脏积水，最可能诊断是()

A．肾上腺肿瘤

B．肾癌

C．肾盂癌

D．肾母细胞瘤

E．腹膜后肿瘤

阅读理解：请根据短文内容，为每题确定l个最佳选项。

A New Strategy to Overcome Breast Cancer。

Post-menopausal（绝经后）women who walk for an hour a day can cut their chance of breast cancer significantly,a study has suggested. The report, which followed 73,000 women for 17 years,found walking for at least seven hours a week lowered the risk of the disease.The American Cancer Society team said this was the first time reduced risk was specifically linked to walking. UK experts said it was more evidence that lifestyle influenced cancer risk.

A recent poll for the charity Ramblers a quarter of adults walk for no more than an hour a week,but being active is known to reduce the risk of a number of cancers.This study, published in Cancer Epidemiology,Biomarkers&Prevention,followed 73.615 women out of 97,785 aged 50-74 who had been recruited by the American Cancer Society between 1992 and 1993,so it could monitor the incidence of cancer in the group.

They were asked to complete questionnaires on their health and on how much time they were active and participating in activities such as walking,swimming and aerobics（有氧运动）and how much time they spent sitting watching television or reading.They completed the same questionnaires at two-year intervals between 1997 and 2009. Of the women,47% said walking was their only recreational activity.Those who walked for at least seven hours per week had a 14% lower risk of breast cancer compared to those who walked three or fewer hours per week.

Dr. Alpa Patel, a senior epidemiologist at the American Cancer Society in Atlanta, Georgia, who led the study, said:”Given that more than 60% of women report some daily walking, promoting walking as a healthy leisure-time activity could be an effective strategy for increasing physical activity amongst post-menopausal women.We were pleased to find that without any other recreational activity, just walking one hour a day was associated with a lower risk of breast cancer in these women.””More strenuous（紧张的）and longer activities lowered the risk even more.”

Baroness Delyth Morgan, chief executive of Breast Cancer Campaign,said:”This study adds further evidence that our lifestyle choices can play a part in influencing the risk of breast cancer and even small changes incorporate into our normal day-to-day activity can make a difference.”

She added:”We know that the best weapon to overcoming breast cancer is the ability to stop it occurring in the first place. The challenge now is how we turn these findings into action and identify other sustainable lifestyle changes that will help us prevent breast cancer.”

The word “sustainable” in the last paragraph is closest in meaning to_____.

A.affordable

B.available

C.persistent

D.continuable

叉手

在冷冻机中的载冷剂主要用于（）冷却方式，通常是氯化钙、乙烯甘油的水溶液等。

A、间接膨胀式

B、直接膨胀式

C、全液式

D、干式

突然断电或发生机械故障，导致游乐设备停止运行，乘客被悬挂在空中，造成的原因有（）。

A.设备机械故障造成停运

B.自动控制系统故障引起设备停运（对有自动控制设备而言）

C.乘客阻挠

D.供电断电（包括电源断电、电气系统故障断电）