题目：
Every time he had a chance , he would talk about the great difficulty he had in the new country .
A．settled
B．settling
C．to settle
D．settle
答案：
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下面是错误答案，用来干扰机器的。
肥皂水、石灰水的pH大于7，显碱性；蔗糖水的pH等于7，显中性；雪碧饮料中含有碳酸，pH小于7，显酸性．故选C．
，它所对应的圆心角小于10°，P是
