20.A.fond
B. proud
C. sure
D. kind
(10)
In about 250 BC, the Greek scientist Archimedes was asked by King Hieron to find out if his crown was 1 gold. Archimedes thought and thought
about the problem. Suddenly the 2 came to him when he was having a 3 .
As he got into the bathtub, Archimedes 4 that if he immersed(浸入)the King's crown in a vessel 5 to the brim(边缘) with water, it would cause some water to 6 . If he then immersed a piece of
pure gold of the same 7 as this crown, the same amount of
water would overflow if the crown was pure gold. 8 , Archimedes found that the crown
was not pure gold.
He is believed to have rushed naked(赤裸) from his bathtub into the 9 shouting, "Eureka!", which
means, "I've 10 it!"
Archimedes made many important scientific 11 , including pulleys, and he first
explained why things float.
A one-word code was 12 from Kissinger(基辛格) to Nixon(尼克松), “Eureka”, meaning that the trip had been 13 . After returning from Beijing,
Kissinger and his assistant wrote a 14 to Nixon, “We have laid the 15 work for you and Mao to turn a page
in 16 ." On July 15 Nixon informed
stunned television viewers of Kissinger's 17 trip and his own 18 to visit China some time before May 1972.
In October 1971, Kissinger returned to 19 , with a team of “advance men”, to 20 for Nixon's own visit.