题干
Don't ______. You'll ______ the new surroundings and different ways of lifestyle.
A：lose your heart; apply to
B：lose heart; apply yourself to
C：lose your heart; adapt to
D：lose heart; adapt yourself to
答案(点此获取答案解析）
D
为理想电压表．当电阻箱读数为R1=2Ω时，电压表读数为U1=4V；当电阻箱读数为R2=5Ω时，电压表读数为U2=5V．求：
