“给我一个支点，我将翻转整个地球。”这句话隐含的物理学的原理是[ ]
A ．浮力定律
B ．杠杆原理
C ．牛顿定律
D ．相对论
答案：B
Now let me tell you the work I have been doing with them. My job with the UN is not paid, but voluntary and as I said _______, I mainly visit countries where the UN has programs to help people.
A．before
B．although
C．even
D．in case
4岁儿童股骨干骨折应如何固定（）
A.骨牵引
B.后侧石膏托
C.水平皮牵引
D.悬吊皮牵引
E.髓内针固定
