红色能使人联想起生命的鲜血和兴奋,红色使一种能使人感到最明亮和最刺激的颜色。所以红色使人联想到()和(),也被人们视为一种具有强大生命力的颜色。
参考答案:发怒;危险
She was looking for her three nephews, but they were nowhere _____, which made her worried. [ ]
A. to be found
B. found
C. seen
D. to see
0.040mol/L碳酸溶液的pH值为(Ka1=4.2×10-7、Ka2=5.6×10-11)()。
A.3.89
B.4.01
C.3.87
D.6.77