A:我国所处的纬度高
B:我国跨纬度大
C:离海的远近不同
D:地形起伏大
根据句意,写出括号内所给单词的适当形式。It's my cousin's ____ (twenty) birthday next week.The weather in Nanjing is ____ (pleasant) in summer. It's always too hot.People screamed with____ (excite) when the match began.He was so tired that he fell____ (sleep) soon after he went to bed.
要使分式x+2x-1有意义,则x的取值应满足( )
磁铁既有吸力也有斥力。( )