Answer:
30
Explanation:
1 closet would contain 15 backpacks. Double that to get 30
1. He wishes he had a larger laboratory to be able to develop his invention
2.If only we had antivirus programs installed in our systems
3.If only I have the chance to use the 3D printer more often, it would change a lot of things
4. She wishes she had payed attention during the demonstration
5.If only he had listened during the course of the experiment
6.She wishes she has a new tablet
Answer:
A: A new blood test makes it easier-and safer-to detect concussions.
Explanation:
The main idea of the passage is A new blood test makes it easier—and safer—to detect concussions.
Notice the phrases question the use of and proposed an alternative way. They suggest that the main idea involves a possible solution to a problem. Here, the main idea is that the problem of detecting concussions without radiation could be solved by a simple blood test.