加快杂交育种世代进程的方法有（）。
A.提早测产
B.异地加代
C.回交选育
D.异季加代
E.越级提升
参考答案：B, D
The number of college graduates ________ surprisingly large and a large number of them ________
unable to find a proper job. [ ]
A. is; is
B. are; are
C. are; is
D. is; are
肉桂粉末含（）
A.草酸钙砂晶
B.草酸钙簇晶
C.晶纤维
D.油细胞
E.胶丝团块
