题目内容
．Nowadays meteorologists can make good forecast for 3 or 5 days ．Perhaps soon they may be able to do that for a week or ____．
| A．more behind | B．more ahead | C．less behind | D．less ahead |
B
略
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．Nowadays meteorologists can make good forecast for 3 or 5 days ．Perhaps soon they may be able to do that for a week or ____．