吸尘罩是间接靠近尘源的吸入口，吸尘效果除了与吸尘风量有关外，还与形式和安装位置有关。（）
参考答案：错
How _____________ Chinese books can you see? [ ]
A. much
B. many
C. long
29．______, you’ll never be able to persuade him.
A．However hard may you try
B．Try however hard you may
C．However hard you may try
D．Try hard however you may
