【32】A．acceleratorB．actorC．amplifierD．observer

目前国际上公认的衣着标准TPO原则中的O是指A、ObeyB、ObjectC、Observe

Black holes exist but are difficult to observe.A．RightB．WrongC．Not mentioned

The behavior. is stemmed from his idea.A.flowsB.comesC.watchesD.observe

Recently scientists have observed increased pollution in the water supply.A.LateB.LaterC.

A good organizer pays attention to detail.A.recipientB.actorC.employeeD.planner

【C2】A．watchedB．relatedC．wroteD．observed