According to the text, children collect money on Halloween to （）.
A. buy strange and frightening costumes
B. buy themselves candy from the neighbors
C. help UNICEF hold an international meeting
D. help poor children throughout the world
查看答案
The purpose of the "tank test" is to find out （）.
A. how much air passengers need to breathe at certain altitudes
B. how much air can be pumped into the plane
C. what would happen if the plane crashed in the water
D. if there are any weak parts in the plane that would burst under pressure
The best title for this passage is （）.
A. Dolphins
B. Fish
C. Mammals
D. Cows
What can we learn from the first paragraph（）
A dolphin is a special kind of fish.
B. Dolphins can"t swim very quickly.
C. Dolphins can live only in the sea.
Dolphins produce their babies on land.
4（）
A. where
B. when
C. while
D. how
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