黄瓜（）强度具有明显的时间性。
参考答案：光合作用
智利的首都在阿根廷首都的（ ）
A．东北
B．西北
C．东南
D．西南
She tried hard to keep calm in face of the students, but the sweat on her forehead _____ her ____.
A．gave; away
B．tuned; down
C．showed; out
D．shut; off
