（）中核酸含量不高。
A.瘦肉
B.鱼类
C.虾类
D.动物肝脏
参考答案：A
Choose the correct sentence:____.
A．That’s all what I need.
B．That’s something I need
C．That’s what that I need.
D．That’s all which I need.
The teacher is writing ____ a piece of chalk on the blackboard while the students are writing ____ink in exercise books.
A．with, in
B．in, with
C．in, in
D．with, with
