题目内容：
There are over 80 species of whales, dolphins and porpoises, (1)回答D
collectively as ‘cetaceans’, throughout the world. They come in all shapes and sizes. Here are some facts and figures about these incredible animals.
The blue whale is (2)回答
B
animal on Earth. The average adult length is 25m for males and 26.2m for females, (3)回答
B
body weights of 90-120 tonnes.
Hector.s dolphin is the world.s shortest cetacean. They may be only 1.2m long when fully (4)回答
A
.
A blue whale eats up to 4 tonnes of krill daily. This is equivalent (5)回答
C
a fully grown African elephant every day.
The sperm whale (6)回答
B
dive deeper than any other cetacean. They have been known to dive as deep as 2000m.
One bowhead whale is reported to (7)回答
A
130 years old when it died.
The sperm whale has the world.s heaviest brain (8)回答
C
can weigh up to 9.2kg. This compares (9)回答
C
the average 1.4kg for the brain of an adult human.
The baiji dolphin, or Chinese river dolphin, is the rarest dolphin in the world and is reported to be endangered. It lives in the Yangtze River in China. Conservation measures (10)回答
D
by the Chinese to save it.
1. A. know B. to know C. knowing D. known
2. A. heavy and long B. the heaviest and longest
C. the most heavy and long D. heavier and longer
3. A. whose B. with C. have D. which
4. A. grown B. growing C. to grow D. grow
5. A. to eat B. about eating C. to eating D. as eating
6. A. believed to B. is believed to C. was believed to D. has believed to
7. A. have been B. be C. being D. having been
8. A. who B. what C. which D. whom
9. A. to B. as C. with D. for
10. A. are taking B. are taken C. were taken D. are being taken
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