--- Does it rain a lot in this area?

　 --- 　　　　, it hardly ever rains; the climate is like that of a desert.

　 A．What’s more B．In other words　　　　　　　 C．On the contrary D．As a result

Her mother expected her to be a doctor, but she _____ her mother’s wish.

A. obeyed 　 B. faces　 C. went against 　 D. was against

The heat ________from her white sand formed a mirage.

A. reflected　 　　B. reflecting 　　C. to reflect 　　 D, have reflected

----You’re drinking too much.

----- Only at home. No one ______ me but you.

A. is seeing 　 B. had seen　 C. sees 　 D. saw

The pen ______he is writing is mine.
A. with which B. in which C. on which D. by which

The suggestion that we_____a group of these records _____as soon as possible was adopted by the committee. 

A . have; printed  B. should have; printing  C. will have; print  D. have; to be printed

As teachers, we ________ be considerate of our students' feelings and appeal to them. Only in this way will they trust us.

A．would B．should

C．ought D．might

I have no desire other than to lead a quiet life, ______ from anxiety.

　　 A. absent　 B. separate　 C. free　　 D. short

根據(jù)C、H、O形成價(jià)鍵的特點(diǎn)，分別判斷出每個(gè)球所代表的原子，得結(jié)構(gòu)簡(jiǎn)式為:HO-CH₂-CH₂-COOH.因此不含氨基。