20130317 quiz 4 (13, 16, 17)Huxy 学员版

1. Just as exercise ___ the heart and lungs, bones and muscles, it may also ___ the brain. A. strengths…make up C. advances…bring up

B. promotes…set up D. strengthens…power up

2. ___ scientific studies of animals suggest that physical activity has a positive effect ___ mental functioning. A. A succession of …on C. A lots of…about

B. An amount of…for D. A great deal…on

3. It’s ___ that the brain ___ from exercise.

A. clear…advantages C. clearly…results

B. clear…benefits D. clearly…derives

4. Vigorous ___ exercise provides the brain___ more fuel.

A. physical … to

B. mental…for D. manual…/

C. physical …with

5. The animals that learned to go through the obstacle course ___ a greater number of brain connections ___ the animals in the exercised or inactive groups.

A. explored… against C. exhibited…than

B. expressed… for D. exchanged…to

6. In ___, the animals that exercised inside the automatic wheel possessed a greater density of blood vessels in the brain than ___ either of the other two groups of animals.