一次函数y=-2x+b不经过第一象限,则b的取值范围是( )
A.b>0
B.b<0
C.b≥0
D.b≤0
∵一次函数y=-2x+b不经过第一象限,
∴b≤0.
故选D.
根据句意、释义或中文提示,写出句中所缺单词,使句子通顺。
小题1:His parents are angry at his school work. They can’t see his ____________ (进步)after each exam.
小题2:I don’t know ____________ ( if ) I will have time to join in some activities at school.
小题3:Sometimes, I want to ____________ (say that you will not do something) to do so much homework.
小题4:Orange and yellow are warm colours, they can give you a happy and ____________ (满意的) feeling.
小题5:Peter is doing an ____________ in the laboratory now.
十八届三中全会强调,()是决定当代中国命运的关键抉择,是党和人民事业大踏步赶上时代的重要法宝。
A、和平与发展
B、改革开放
C、中国特色社会主义