6. The landscape can change abruptly after a rainstorm in the desert in Xinjiang.
A. suddenly B. sharply C. favorably D. slightly
7. He manipulated the controls of the plane so well that it did not crash.
A. devised B. prolonged C. handled D. cooperated
8. You have violated our agreement by not doing the work you promised.
A. irritated B. broken C. amended D. patched
9. We should never underestimate influence we can have on the children we love.
A. undersell B. undervalue C. disregard D. misjudge
10. The ultimate cause of the American Civil War was the bombardment of Fort Sumter.
A. final B. unique C. true D. straight

参考答案
6-10. ACBBA