（）是北方第一个著名的青瓷窑，烧制御用宫中之器，时间很短，数量也少。
A.汝窑
B.钧窑
C.哥窑
参考答案：A
Research indicates that _____ 75% of kids with learning disabilities have such difficulties as making
and keeping friends.
[ ]
A. as much as
B. as long as
C. as many as
D. as far as
夏枯草的主要功效是
A．清心B．清肺C．清肝D．清胃E．清小肠
