超声波生物物理学特性中最基本的原发作用是
A．机械作用
B．温热作用
C．理化作用
D．弥散作用
E．压迫作用
参考答案：A
坚强意志是克服困难、获得成功的唯一条件。[ ]
—We plan to go out for a picnic next weekend. Would you like to come along?
—______. It's my favorite.[ ]
A. Enjoy yourself
B. It doesn't matter
C. You're welcome
D. That would be very nice
