The passage implies that modern airlines are （）.
A. reliable
B. dangerous
C. complicated
D. efficient
查看答案
What can be inferred from the passage（）
A. Dolphins have highly evolved.
B. Mammals don"t eat plants at all.
C. All fishes developed from land animals.
Dolphins were once closely related to humans.
A test flight is dangerous because the test pilot has to （）.
A. fly his plane at a very high altitude
B. secure a safe landing in a plane crash
C. find out how to handle a plane when its engines stop working
D. fix the damaged engines during the flight
Different from fish, dolphins （）
A. live on land
B. breathe with lungs
C. breathe under water
D. live without oxygen
On which day is Halloween celebrated each year（）
A. The second Sunday in May.
B. The fourth Thursday in November.
C. February 14.
D. October31.
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