What did scientist do for the space shuttle missions?

A、Theytriedtomeetastronauts’specificrequirements.
B、Theytriedtomakebestuseofthelatesttechnology.
C、Theydevelopedobjectsforastronautstouseinouterspace.
D、Theyaccuratelycalculatedthespeedoftheorbitingshuttles.