1. too much carbon dioxide in the air can be …………… for humans to breathe.
a. poisonous b. unfriendly c. healthy d. poison
2. the new invention could have a wide range of ………………..in industry.
a. applications b. concerns c. goodness d. advance
1. too much carbon dioxide in the air can be =… for humans to breathe. a. poisonous b. unfriendly c. healthy d
By Katherine
1. A
2. D
1. too much carbon dioxide in the air can be …………… for humans to breathe.
a. poisonous b. unfriendly c. healthy d. poison
2. the new invention could have a wide range of ………………..in industry.
a. applications b. concerns c. goodness d. advance