浇注系统中起挡渣作用的是内浇道

What can we know about the man from this conversation？

A．He likes all kinds of rocks.

B．He has traveled a lot.

C．He doesn"t mind smoking.

D．He only goes to exhibits.

请帮忙给出正确答案和分析，谢谢！

儿科门诊一2周岁患儿，疑患蛔虫病。经检查发现，其每克粪便含蛔虫卵4000个。则该患儿的蛔虫感染度为

A、轻度

B、中度

C、重度

D、极重度

E、无法判断

请帮忙给出正确答案和分析，谢谢！

The passage is mainly about______.

A．the development stages of Alzheimer"s disease

B．the pregnancy zone protein

C．a new discovery concerning Alzheimer"s disease

D．patients of Alzheimer"s disease

请帮忙给出正确答案和分析，谢谢！

What does Dr. Luiders study tell us about the pregnancy zone protein？

A．It never increases before the appearance of Alzheimer"s symptoms.

B．Levels of it remain stable for men"s lifetime.

C．Women developing Alzheimer"s usually have lower levels of it.

D．The brain plaques connected with Alzheimer"s produce it.

请帮忙给出正确答案和分析，谢谢！

在细胞膜的物质转运中，Na+跨膜转运的方式是

A、单纯扩散和易化扩散

B、单纯扩散和主动转运

C、易化扩散和主动转运

D、易化扩散和入胞

E、单纯扩散、易化扩散和主动转运

请帮忙给出正确答案和分析，谢谢！