2．4．7 Exercises练习
Ⅰ．Sentence translation．
1．Jupiter is 5 times far from the sun as is the earth．
2．Cork is 0．25 times as heavy as water; mercury weighs 13．5 times as much as water．
3．The volume of the earth is 49 times larger than that of the moon．
4．This lathe improves the working conditions and raises efficiency fourfold．
5．New boosters can increase the payload by 120%．
6．The speed exceeds the average speed by a factor of 2．5．
7．The sales of industrial electronic products have multiplied six times since 1990．
8．The population of this small town has doubled in the past twenty years．
9．The efficiency of these machines has been more than trebled or quadrupled．
10．The price of mobile phones was reduced by 75%．
11．A is three times smaller than B．
Ⅱ．Passage translation．
All whales fall into two groups，those with teeth and those without．Both beluga and dolphin belong to the suborder of toothed whales known as Odontoceti，along with porpoises，narwhals，pilot whales，killer whales and the largest toothed creature in the world，the sperm whale．Size differences among the Odontoceti are remarkable．A common porpoise will run only 4 to 5 feet in length and 300 pounds in weight; a sperm whale may be 10 times as long and 300 times as heavy．The beluga falls in between，weighing up to 2，000 pounds．And it does chirp．In fact，it makes a great variety of squeaking，whistling，and clicking sounds，which have earned it the name of sea canary．
The toothless，or baleen，whales belong to the suborder of Mysticeti．This is a group of generally large whales，formerly abundant in all the oceans of the world．Though reduced by hunting，most species are still found along the coasts of the United States and Canada．All but two of the Mysticeti reach 40 feet or more at maturity，with the blue whale running up to 100 feet and tipping the scales at up to 130 tons．This whale is by far the largest creature that has ever lived on earth，4 times the weight of the largest dinosaur，30 times that of an elephant．
(This passage is taken from TOEFL test in 1988)