花菱草在()开花。
A.春季
B.夏季
C.秋季
D.冬季
参考答案:A
农业措施的小气候效应:()、垄作、灌溉。
He began to learn the accordion at the age of four. (选出与画线部分意思相同的选项) [ ]
A. before four
B. after four
C. when he was four
D. at four o'clock