题目内容

______ warmly and you won’t catch a cold.

A. Dress
B. To dress
C. Don’t dress
Dressed

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______ interrupt me when I am speaking. It’s rude.

A. Please
B. Please not
C. Please don’t
D. Pleased

Walk two blocks and ______ left on Oak Street.

A. turning
B. turn
C. turned
D. turns

体内进行嘌呤核苷酸从头合成的器官是（）

A. 胸腺
B. 骨髓
C. 肝
D. 脾

嘌呤核苷酸从头合成时首先生成的是（）

AMP
B. GTP
C. IMP
D. ATP