实验室中所使用的电流是由小量程电流表改装而成，在图甲中是满偏电流（即小量程电流表允许通过的最大电流）I_g=3mA的电流表，其电阻R_g=10Ω，现借助一个定值电阻R₀把它改装为一量程为3A的电流表，如图乙所示，下列判断正确的是（　　）

“治自然科学者，局守一门，而不肯稍涉哲学，而不知哲学即科学之归宿，其中如自然哲学一部，尤为科学家所需要。”蔡元培先生的这一论述表明（    ）

①自然科学与哲学是密切联系的

②哲学是“科学之科学”，对自然科学研究具有指导作用

③研究自然科学的目的在于推动哲学的进步和发展

④自然科学研究离不开哲学所提供的世界观和方法论的指导

根据短文理解，从A、B、C、D四个选项中选择最佳填空。

    Hi, my name is Dave. I'm 8 1 old. My birthday is 2 December 12th. I have 3 birthday party every year. Today I have my 4 birthday party. I get some gifts at the party. 5 are very good and I really like them. This 6 T-shirt is from my mother. Green is my 7 color. My mother buys me a pair of green 8, too. My father buys some 9 about history for me, because I like 10 best. I think these books 11 very interesting. My grandparents 12 I like playing basketball, 13 they buy me a basketball. I can 14 it with my friends after class. I'm very happy today.

    15 is your birthday, my friend? Do you have a party, too?