【单选题】Most geologists believe ______ from the remains of tiny marine plants and animals that died millions of years ago.
A.
what was formed petroleum
B.
that petroleum was formed
【单选题】数据寻址过程中,直接寻址、间接寻址、立即寻址等三种寻址方式指令的执行速度,由快至慢的排序是 ( )
【单选题】直接、间接和立即三种寻址方式指令的执行速度,由快至慢的排序为( )。
【单选题】Coral reefs are one of the most fragile, biologically complex, and diverse marine ecosystem on Earth. This ecosystem is one of the fascinating paradoxes of the bio- sphere: how do clear, and thus nutr...
A.
describing the effects of human activities on algae in coral reefs
B.
explaining how human activities are posing a threat to coral reef communities
C.
discussing the process by which coral reefs deteriorate in nutrient-poor waters
D.
explaining how coral reefs produce food for themselves
E.
describing the abundance of algae and filter-feeding animals in coral reef areas