In the following essay, each blank has four choices. Choose the most suitable one from the four choices and write down in the answer sheet.
Open Shortest Path First (OSPF) is a (36) routing algorithm that (37) work clone on the OSI IS-IS intradomain routing protocol. This routing, as compared to distance-vector routing, requires (38) processing power. The (39) algorithm is used to calculate routes. OSPF routing table updates only take place when necessary, (40) at regular intervals.

A．but rather

B．rather too

C．rather than

D．rather that

测得一名儿童的智商为60，他属于（）。

A、正常儿童

B、智力超常儿童

C、弱智儿童

D、聋、哑、盲儿童