鱼类的消化腺主要有什么？
参考答案：
鱼类的消化腺主要有胃腺、胰腺、肝脏和肠腺等。
Where does a giraffe live?[ ]
A. In a river.
B. In a hole.
C. In the zoo.
—Excuse me, how can I get to the station?
—Turn left and then go straight on. You _______ miss it. [ ]
A. may not
B. needn't
C. shouldn't
D. can't
