What is the ozone layer made of?

The word “constrained” in paragraph 4 is closest in meaning to______.

According to the passage, who was the first person to use artificial refrigeration for a practical purpose?

According to the passage, the first refrigerated railcar used what material as a cooling agent?

The word "rough"in the passage is closest in meaning to ___________.

The word “it” in paragraph 3 refers to______.

What is the main point the writer is trying to make in the last paragraph?

How did Juliette Davidson benefit from the experience of her first job?

According to the passage, the doers of education are _____.

According to the passage, all of the following are true EXCEPT___________.

The writer learnt to sail ___________.

This passage is mainly aimed at _____.

The word "These" in paragraph 3 refers to

By discovering and better understanding your own learning styles, you can improve _______.

What can be inferred from paragraph 1 about cold storage before the invention of artificial refrigeration?

The word "ball" in paragraph 2 probably means _________.