一个因数不变，另一个因数扩大3倍，积会[ ]
A．不变
B．扩大3倍
C．缩小3倍
答案：B
凡治病，必察其 ① ，适其脉，观其志意，与其 ② 也。(素问·五脏别论)
---I have a headache.
---_______.
A．That’s OK
B．I’m sorry to hear that
C．Thank you
D．I think so
