依金属腐蚀过程的特点将其分为（）。Ⅰ.全面腐蚀；Ⅱ.局部腐蚀；Ⅲ.化学腐蚀；Ⅳ.电化

小题1:The laptop on the teacher’s desk is not yours. It b_____ to Harry.

小题2:While shopping, we always b______ with the shopkeeper in order to reduce the price.

小题3:The children waited until the policeman s_________ to them to cross the street.

小题4:I don’t know how to choose a mobile phone. Science and t________ is changing so fast!

小题5:I really a________________ it that you helped me so much when I was in need.

小题6:When people found the missing boy in the forest, they all smiled in r__________.

小题7:On hearing the funny story, the whole class burst into l___________________.

小题8:To be h______________, to start a business of my own is not as easy as I expected.

小题9:When I opened the letter, I found some photos a__________________ it.

小题10:The p_____ we saw last night was really wonderful. It was worth my time and effort.

可使色素沉着减退的因素是（）

A.维生素B

B.维生素C

C.叶酸

D.烟酸

患者女，40岁，因“双侧上睑下垂2年，加重伴四肢无力2个月”来诊。症状晨轻暮重；既往体健。查体：构音障碍，双侧睑裂变小，四肢近端肌力差。

除睑裂变小外，其眼部体征还可能表现为（）

A.双眼上视受限

B.双眼下视受限

C.双眼内收受限

D.双眼外展受限

E.双侧对光反射灵敏

F.双侧对光反射迟钝

G.双侧对光反射消失

合成N-亚硝基化合物，必须有何种物质存在

A．胺类
B．氮氧化物
C．亚硝基化剂
D．胺类与亚硝基化合物
E．胺类与硝酸盐

固定大桅用的绳索称为（）

A.固定索；

B.动索；

C.稳定索；

D.静索。