在下列条件中能抑制类胡萝卜素的自动氧化反应的条件是（）。
A.高水分活度
B.高温
C.氧化剂
D.低水分活度
参考答案：A
两根木棒的长分别为5和7，要选择第三根木棒，将其钉成三角形，若第三根木棒的长选取偶数的话，有（ ）种取值情况。
—Where are the guests to be from tomorrow?
—Many an American boy and many a British girl as well as the teachers to he present.
A．have been invited
B．has been invited
C．were invited
D．was invited
