题目内容

病毒性关节炎，1-20日龄的鸡最易感，发病多见于（）周龄的鸡。

A. 3-6
B. 4-7
C. 5-8
D. 2-3

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下列属于病毒性关节炎特征的是（）。

A. 病鸡跛行。
B. 跗关节肿大，呈墨绿色，按压有波动感。
C. 趾屈肌腱和趾伸肌腱肿胀、出血。
D. 跗关节内常含有枯草色或带血色渗出物，滑膜常有出血点。

climb the tree, it's dangerous.

A. Don't
B. Not
C. No

________ kind and helpful to the people around us, and we will make the world a nicer place to live in.

A. Been
Being
C. To be
D. Be

Today is Tony's birthday. Let's __________ his birthday.

A. make a card to
B. makes a card for
C. make a card for
D. making a card to