A：砍伐森林．开垦草原，开发新的耕地
B：捕捉珍稀野生动物，进行人工饲养
C：积极围湖造田种粮，增产粮食
D：跨流域调水，改变水资源的地区分布不平衡状况
化学式
电离平衡常数（25℃）
HCN
K=4.9×10﹣10
CH3COOH
K=1.8×10﹣5
H2CO3
K1=4.3×10﹣7、K2=5.6×10﹣11
It was Saturday. Mike stayed at home alone(单独地). His parents went to visit his grandparents in another city. He did his homework and read books. After lunch, he watched TV and played basketball on the playground with Jack. He felt very tired. In the evening, his parents came back and brought him some presents. They were a schoolbag and a basketball. Mike felt very excited!
下面是课文《秋天的怀念》中描写母亲的动作、语言、神情、心理等的句子，表现了母爱的伟大。试结合上下文作具体分析。
①母亲就悄悄地躲出去，在我看不见的地方偷偷地听着我的动静。
②母亲扑过来抓住我的手，忍住哭声说：“咱娘儿俩在一块儿，好好儿活，好好儿活……”
③她憔悴的脸上现出央求般的神色。
④还记得那回我带你去北海吗？你偏说那杨树花是毛毛虫，跑着，一脚踩扁一个……
⑤她忽然不说了。对于“跑”和“踩”一类的字眼儿，她比我还敏感。
下列仪器利用红外线来工作的是（ ）
