A:澳大利亚东南部的小麦—牧羊带
B:潘帕斯草原的牧牛业
C:亚洲水稻种植业
D:美国的商品谷物农业
阅读短文, 选择正确的答案。
The red coat is my mother's. It's very beautiful. The brown jacket is my father's. The blue pants are my brother's. They're new. The orange shorts aye my sister's. She likes them very much. The green socks are mine.
研究历史离不开文字资料,我国有文字可考的历史开始于( )
手中有一叠薄纸,若要测出其中一张纸的质量,下列方法可取的是( )