第8题和第9题

影响合金收缩的因素有化学成分、浇铸温度、铸件结构与铸型条件

此题为判断题(对，错)。请帮忙给出正确答案和分析，谢谢！

The word "disheartening" in Paragraph 7 has a similar meaning to______.

A．indifferent

B．furious

C．scared

D．frustrated

请帮忙给出正确答案和分析，谢谢！

浇注系统中起挡渣作用的是内浇道

此题为判断题(对，错)。请帮忙给出正确答案和分析，谢谢！

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！