要使(x﹣a)(2x+2)的积中不含x的一次项,则a的值为[ ]
A.﹣1
B.1
C.2
D.﹣2
答案:B
鼻饲食物的合适温度是()
A、36~38摄氏度
B、38~40摄氏度
C、40~42摄氏度
D、42~44摄氏度
The President likes to ______ himself as a friend of working people.
A.decorate
B.ornament
C.portray
D.narrate