【多选题】骨质疏松症常与以下哪些因素有关:(多选)
【单选题】________ from space, the earth , with water_______ seventy percent of the surface , looks like a blue ball.
【简答题】a bolt from the blue
【单选题】There is nearly always an element of the bolt from the blue about a poem's origin .
A.
a poem's disastrous beginning
B.
a poem sudden beginning
C.
a sudden inspiration as the impetus for a poem
D.
a quick revelation of the writing of the poem
【单选题】He couldn't bolt from the door or the windows because they were .
【单选题】Because of the strong sun, Mrs. White’s new dinning-room curtains ______ from dark blue to gray within a year.