草履虫的表膜不具有下列哪一项功能[ ]
A．保护
B．呼吸
C．排泄
D．消化
答案：D
切变线是指在850hPa或700hPa高空，温度出现的不连续线。（）
Although his people did not________his efforts, he kept trying.
A．agree with
B．apply to
C．approve of
D．consent with
