用科学计数法表示的数-3.6×10-4写成小数是( ).
A.0.00036
B.-36000
C.-0.00036
D.-0.0036
答案:C
解:,故选C。
鸟卵的结构中相当于卵细胞的一组是( )
A.卵黄膜、卵黄、胚盘
B.卵壳膜、卵白、卵黄
C.卵壳、卵壳膜、卵白、卵黄
D.整个鸡卵
-___________ do you go to Old People’s Home?
-Twice a month.
A.How long
B.How soon
C.How often
D.How many times