—Yes, it ____ (rain) yesterday.
①外国列强对中国开始资本输出 ②沙俄侵占我国大片领土
③中国领土完整开始遭到破坏 ④清政府保证严禁人们参加反帝斗争
That's the man ________ house was destroyed in the storm.
下列各项属于动物学习行为的是( )