模仿秀。 1．自从女娲创造了人类，大地上到处是欢歌笑语。 2．山冈上燃烧着熊熊

某人患甲状腺肿大症，他缺乏的元素主要是（　　）

A．铁元素

B．钙元素

C．磷元素

D．碘元素

Studies have shown that people who rarely take antibiotics, which are antibacterial drugs, have per immune systems than do people who take antibiotics frequently. Yet there is no evidence that taking antibiotics weakens the immune system.
Which of the following, if true, best reconciles the apparent discrepancy in the information above ？（）

A．People who have p immune systems seldom get the kinds of infections for which people normally take antibiotics.

B．People who have p immune systems are seldom aware that their immune systems are unusually p.

C．People who have weak immune systems have great difficulty recovering from bacterial infections if they do not take antibiotics.

D．Some people take antibiotics even though the antibiotics cause a variety of side effects.

E．Some people take antibiotics frequently because their doctors prescribe antibiotics for viral infections as well as for bacterial infections.

试述全面贯彻“三个代表”重要思想的重要性以及如何全面贯彻“三个代表”重要思想。

湿热腰痛的特点是（）

A.腰部疼痛，重着而热

B.腰痛如刺，痛有定处

C.腰部冷痛重着

D.腰部隐痛

E.腰部酸软无力

2007年4月2日，王某与丁某约定：王某将一栋房屋出售给丁某，房价20万元。丁某支付房屋价款后，王某交付了房屋，但没有办理产权移转登记。丁某接收房屋并作了装修，于2007年5月20日出租给叶某，租期为2年。2007年5月29日，王某因病去世，全部遗产由其子小王继承。小王于2007年6月将该房屋卖给杜某，并办理了所有权移转登记。请回答71～74题。

如杜某向丁某、叶某请求返还房屋，下列选项正确的是：( )。

A．杜某无权请求丁某返还房屋

B．杜某有权请求丁某返还房屋

C．杜某无权请求叶某返还房屋

D．杜某有权请求叶某返还房屋