硅质泥岩的SiO2含量比硅质页岩低。（）
参考答案：错
I didn’t feel like ________, so he suggested ________ an English song right away.
A．reading; practising singing
B．reading; practising to sing
C．to read; practicing singing
D．to read; practicing to sing
A．声明语句和可执行语句
B．简单语句和复杂语句
C．顺序语句和判定语句
D．程序语句和注释语句
