单项选择题

Which of the following has the highest pH in an aqueous solution of the same concentration ( )

A．NaCl
B．NaHCO3
C．NH4Cl
D．Na2CO3

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单项选择题

清胃散中应以何药为君： A.
生地养阴凉血
B.
升麻散火解毒
C.
黄连清胃泻火
D.
丹皮凉血清热
E.
以上都不是

单项选择题

关于风向，以下正确的是________ 。
which one is correct about direction of winds?

A．风向是指风的来向 the direction of the wind is where it comes
B．风向是指风的去向 the direction of the wind is where it goes
C．风向等于有时候是来向，有时候是去向，有使用者确定。the direction of the wind is depended on the user
D．以上对不对。all above are false