5-2的相反数是______；绝对值是______．

I couldn’t help but_____very concerned about his illness when I heard he was in hospital because of heart disease.

A．to feel

B．feel

C．feeling

D．to have felt

用括号内所给单词的适当形式填空.

1. In the last three years, they _____ (have) three major concerts.

2. He _____ (go) to Nanjing, and he will be back next week.

3. The rain _____ (stop). Shall we go on with our basketball match?

4. I have got a lot of books _____ (read) for the exam.

5. How long has the man been _____ (die)?

下列几种疾病，RF检出率最高的是（）

A.类风湿关节炎

B.SLE

C.干燥综合征

D.硬皮病

E.皮肌炎

男，26岁，左膝持续性隐痛1个月余。查体：左小腿上端内侧略肿，压痛。X线摄片见左胫骨上端内侧有一肥皂泡样阴影，膨胀性生长，骨皮质变薄。

（假设条件）如果最终确诊为骨肉瘤其最佳治疗方案是（）。

A.单纯化疗

B.单纯放疗

C.单纯截肢手术

D.肿瘤切除人工关节置换

E.化疗--肿瘤切除--化疗

居住在中国境内的外国人和无国籍人也可以是我国某些法律关系的参加者。 ( )