I usually go there by train. Why not by boat for a change?
A:to try going
B:tryingto go
C:to try and go
D:try going
I'd like some ____,please .
一元二次方程x2﹣4x+4=0的根的情况是( )
制作人的口腔上皮细胞临时装片的正确顺序是( )
①取口腔上皮细胞 ②擦干净载玻片和盖玻片 ③盖盖玻片
④把从口腔内取出的碎屑涂在载玻片的水滴中 ⑤在载玻片中央滴一滴生理盐水 ⑥滴碘液染色.