互质的两个数，这两个数不可能是（ ） A．质数和质数 B．合数和合数 C．质数和

Long time ago, our world was very beautiful. There were trees, flowers and rivers. It was very clean and tidy.  1 . We are living in a polluted environment, which is bad for out earth.   2  .The public has been calling for actions against pollution. Scientists have told us to protect out environment,  3 .

The earth is our only home. We should make it comfortable for ourselves and for our children in the future. Now nearly all of the countries are trying their best to stop pollution. Although they have done much, the progress is slow,   4 . No matter how difficult it is, we should try our best to fight against pollution. By working together,   5 .

根据短文内容，从方框中选出能填入空白处的最佳选项，补全短文。（5分）

患者女，14岁，间断咳嗽、咳痰14年，加重1个月入院。患者出生2～3个月开始反复咳嗽、咳大量黄痰，伴发热。多次诊断“肺部感染”，抗感染治疗可好转。近2年患者2次培养均为铜假单胞菌，5年前开始间断咯血，胸部CT示双上肺支气管囊柱状扩张，以上肺为主。自幼汗液干后皮肤遗有盐粒，偶有腹泻和粪便异味。出生时疑有“羊水吸入”。

合理选用的抗生素是（）。

A.选用2种敏感的抗生素联合应用，静脉点滴，加口服小剂量阿奇霉素

B.仅雾化吸入妥布霉素

C.选用大剂量青霉素

D.环丙沙星

E.阿奇霉素

男，17岁，自诉鼻涕中带血3个月，伴耳鸣、听力减退，无发热，影像检查如图，最可能的诊断是（）

A.咽旁脓肿

B.鼻咽部恶性淋巴瘤

C.鼻咽癌

D.小唾液腺混合瘤

E.鼻咽部淋巴组织增生

航空煤油( )以上月新加坡市场离岸价确定的进口到岸完税成本作为接轨价格。

A．出厂价

B．运输价格

C．销售价格

D．成本价格