美国中央大平原和阿根廷潘帕斯草原虽属不同的农业地域类型,但它们的共同发展条件是①地广人稀 ②气候温和 ③高度发达的工业 ④交通便利
A:①②
B:①②③
C:①②④
D:②③④
A: Hi, Jenny!____ my birthday party on Saturday afternoon?
B: Sure,____.
A:____you, Linda?
C: I'm sorry I can't. I ____ study for a test on weekends.
A: That's too bad. Maybe next time.
C: Sure. Thanks for your ____.
读大气受热过程图,回答下题.