Greenhouse gases are to the environment. (harm)
将划线部分的英语译成汉语,注意使用适当的形式.
I like taking a walk in the bamboo forest because the air there is clean and fresh.
根据句意,用括号中所给词的适当形式填空,
To better understand the habits of elephants, the government spent a lot of money doing (科学研究).
I was feeling cold outside but warm inside, while the (北风) was blowing hard.
Without an (身份证), you can't go anywhere in today's world.
I agree. It's of great use.
With great courage and effort, Liu Chuanjian, a national hero, (success) landed the plane, saving over 100 people.