NO 3:

Yoke 美 [joʊk]

v. to join together 紧密联结

-- Two oxen were yoked together and hooked up to pull the plow.

Z

Zealous 美 ['zeləs]

adj. marked by an active interest or enthusiasm 热心的；狂热的；热衷的

-- The lifelong fan was so zealous about getting a ticket to the show that she stayed up all night and slept in the rain just to purchase one.

Zenith 美 ['zenɪθ]

n. the time at which something is most powerful 顶点；天顶；全盛

-- Some suspect that musician is at the zenith of his musical career, and all the songs he produces in the future will be worse that what he has previously produced.

Zigzag 美 ['zɪɡzæɡ]

adj. characterized by sharp turns in different directions 曲折的；锯齿形的

-- The car proceeded in a zigzag fashion, attempting to avoid the cops.

TOEFL Power Vocab 这本书上的单词全部学完了。谢谢自己的坚持，争取以后继续努力。