炼铁用焦炭不但要求有较高的抗碎强度和耐磨强度而且要求有一定的块度，块度越均匀越好。
参考答案：对
The British government often says that providing children with ______ to the information superhighway
is of great importance. [ ]
A. prevention
B. protection
C. allowance
D. access
崩塌
