2016年年初，甲公司购买了一项债券，剩余年限5年，甲公司将其划分为持有至到期投资，

用所给动词的适当形式填空。

l. When I was crossing the street yesterday, I saw an  old man _____ (lie) on the street.

2. He is doing his best _____  ( learn)  how  to swim.

3. All the Chinese people were _____(exciet) when they knew Xu Haifeng won a gold medal in shooting.

4. The teacher told us such _____ (amaze) news that some of us didn't believe it.

5. My younger brother is able_____ ( do)  the  work all by himself.

与SLE疾病活动性相关的抗体是 （）

A.ANA 

B.抗Sm抗体 

C.抗RNP抗体 

D.抗ds-DNA抗体 

E.抗PCNA

患儿，男性，7岁，因慢性根尖周炎导致牙根明显吸收而拔除，X线片检查显示牙胚冠方约3mm牙槽骨覆盖，牙冠发育刚刚完成，口内其余牙齿未见异常，为保持间隙，应选用的间隙保持装置为（）

A.远中导板间隙保持器

B.丝圈式间隙保持器

C.充填式间隙保持器

D.舌弓式间隙保持器

E.Nance腭弓间隙保持器

Conjunctivitis may be caused by bacteria, viruses, allergens, or irritants. What signs and symptoms differentiate bacterial conjunctivitis from other types ？（）

A．Subacute onset, severe pain, and preauricular adenopathy.

B．Recurrent onset, no pain, and clear discharge.

C．Acute onset, moderate pain, and purulent discharge.

D．Acute onset, mild pain, and clear discharge.

隔膜泵的仪表空气和润滑油压力都与主电机设有（）。