单项选择题

The walls are made of hollow concret blocks.（）　

A. big　　
B. empty　　
C. long　　
D. new

点击查看答案&解析

单项选择题

Penguins do not suffer from the cold in Antarctica because their feathers secrete a protective oil.（）

A. hide
B. warm
C. produce
D. absorb

单项选择题

He is absent because he is sick.（）

A. bad
B. good
C. well
D. ill

单项选择题

Clearly, he will win the game.（）

A. likely
B. possibly
C. obviously
D. strangely