Unit Test 9B Key
1 1 the / 2 an / 3 an / 4 the / 5 0 / 6 the
2 1a / 2a / 3b / 4d / 5d / 6a / 7c / 8c / 9c / 10a / 11c / 12b
3
Production
Problems in Space
mass-produce
simulation
prototype
flight test
modification
aviation
meteor
impact
collision
meteorite
deflect
asteroid
4 1e / 2b / 3c / 4d
5 1 do / 2 do / 3 build / 4 find / 5 meet / 6 solve / 7 made
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