根据下图所示的溶解度曲线，判断下列说法中不正确的是（ ） A．t1℃时，甲物质的

At the meeting they discussed three different     to solving the problem.

A．approaches

B．means

C．methods

D．ways

— Why didn't you buy the dictionary?

— I _____, but my mother _____ allow me. She told me she had already bought one for me. [ ]

A. would; didn't

B. would have; didn't

C. had had; wouldn't

D. had bought; hadn't

窦性心动过速的频率范围多为（）

A.150～180次／分

B.100～200次／分

C.130～170次／分

D.120～160次／分

E.100～150次／分

关于鳞状毛囊角化病正确的是（）

A.冬季加重，夏季减轻

B.一般无自觉症状

C.好发于青壮年

D.有时有家族史

E.以上均正确

Internet上的DNS服务器中保存有 (16) 。

A．主机名
B．域名到IP地址的映射表
C．所有主机的MAC地址
D．路由表