增加多孔材料的厚度，可提高______频声音的吸声效果，而对吸收______频声音则无多大影响。

—This box is too heavy for me to carry upstairs.—()().

A. You may ask for help.

B. Let me give you a hand.

C. Please do me a favor.

D. I'd come to help.

—This box is too heavy for me to carry upstairs.

--________ .

A You may ask for help

B I’ll give you a hand

C Please do me a favor

D I’d come to help

- This box is too heavy for me to carry it upstairs.- ____________

A：You may ask for help.

B：I'll give you a hand.

C：Please do me a favor.

D：I'd come to help.

—This box is too heavy for me to carry it upstaris.rn—________________.

A、You may ask for help.

B、I’ll give you a hand.

C、Please do e a favor.

D、I’d come to help.

—This box is too heavy for me to carry it upstaris. —________________.

A、You may ask for help.

B、I’ll give you a hand.

C、Please do e a favor.

D、I’d come to help.

A．A.Please ask for help.

B．B.Let me give you a han

C．C.You may do me a favor.

D．D.I’d come to do.

A．A.You may ask for help

B．B.I’ll give you a hand

C．C.Please do me a favor

D．D.I’d come to help

听力原文：Can you help me carry the heavy box？

A．

B．

C．

Allen had to call a taxi because the box was ______ to carry all the way home.

A．much too heavy

B．heavy too much

C．too much heavy

D．too heavy much