单项选择题
The walls are made of hollow concret blocks.（）
A. big B. empty C. long D. new
Penguins do not suffer from the cold in Antarctica beca...
Penguins do not suffer from the cold in Antarctica because their feathers secrete a protective oil.（）
A. hide B. warm C. produce D. absorb
He is absent because he is sick.（） A. bad B. good C. we...
He is absent because he is sick.（）
A. bad B. good C. well D. ill
Clearly, he will win the game.（） A. likely B. possibly ...
Clearly, he will win the game.（）
A. likely B. possibly C. obviously D. strangely
