材料与用具：细胞培养瓶若干、小鼠神经小胶质瘤细胞（BV﹣2 细胞）悬液、细胞培养液、高糖细胞培养液、浓度为25mg/L、50mg/L和100mg/L的天麻素溶液（用高糖细胞培养液配制）等．

（要求与说明：培养液中IL﹣1浓度的具体测定方法不做要求；IL﹣1β相对表达量=实验组IL﹣1浓度/对照组IL﹣1β浓度； 实验条件适宜）

欧洲人酷爱乳产品和牛羊肉，其饮食结构与下列何种因素有着密切的关系 （ ）

一定质量的松杆，当它的体积V=2m³时，它的密度p=0.5×10³kg/m³，则p与V的函数关系为　____ ．

有甲、乙、丙三种商品，如果购甲1件、乙2件、丙3件，共需136元；购甲3件、乙2件、丙1件，共需240元．则购进甲、乙、丙三种商品各1件共需（　）元．

①In order to protect our environment, we can't freely cut trees without the government's ____(允许)．

②There is no ____ (通路) to the street through that door.

③Humor is a more effective ____(防御) than violence(暴力)．

④Now that you are a college student, you should learn to be ____ (独立的)of your parents' help.

⑤Can you give me a ____(明确的)answer by tomorrow?

⑥With his new method, the time of the project will be ____ (缩短)．

⑦They brought the piano ____(斜着地) through the front door.