7 Eyespots，the most rudimentary eyes， are found in protozoan flagellates，flatworms，and segmented worms.
A．hostile-looking
B．perceptive
C．primitive
D．strangely formed
8 Extending from Quebec to Alabama，the Appalachian Mountain region is extensive and very scenic.
A．vast
B．rustic
C．fertile
D．picturesque
9 In times of economic difficulty，corporate budgets for research and development are often slashed before any others.
A．shifted
B．cut
C．examined
D．presented
10 Hoof-and-mouth disease was eliminated in the United States by slaughtering affected herds of cattle.
A．isolating
B．testing
C．vaccinating
D．killing
答案：1D 2B 3A 4D 5C 6D 7C 8D 9B 10D