题干
—I will never come to this restaurant again.
—______ will I．I never thought the service here could be so poor.
A：Either
B：None
C：Both
D：Neither
答案(点此获取答案解析）
B
④共有8种核苷酸 ⑤共有5种核苷酸 ⑥A均代表同一种核苷