Explain why strategic management is important.

A.To explain why recycling is important.

B.To describe the recycling program.

C.To discuss whether or not recycling should be mandatory.

D.To explain how to find the recycling facilities.

Explain why none of the lanthanoid sesquioxides, Ln₂O₃, is as acidic as Al₂O₃

What' s the main purpose of this talk？

A．To explain why recycling important.

B．To describe the recycling program.

C．To discuss whether or not recycling should be mandatory (命令性的).

D．To explain how to find the recycling facilities.

A that

B the reason for

C why

D why that

Why do you think the author wrote this passage？

A．To explain why language learning is difficult.

B．To teach people to speak English.

C．To compare language learning with other types of learning.

D．To encourage language learners to use these techniques.

A．Well. Perhaps you have to explain why you were not in the office this morning.

B．Why don't you go after 10:00？

C．I don't think you should go to see him right now.

D．You'd better go and see him now.

Biologists are unable to explain why frogs are dying.

A．Y

B．N

C．NG

Explain why nuclear magnetic resonance experiments show only one type of hydrogen atom in theion.