导致心肌收缩加强的肾上腺素能受体为A. α受体B. β受体C. β受体D. M

He opened the door and let himself in quietly ______ not to wake the family.

A．because

B．so as

C．so that

D．despite

A、afraid

B、is afraid

C、to be afraid

D、to being afraid

She opened the door quietly__________ wake up her sleeping baby.

A.in order that

B.so that

C.in order to

D.so as not to

She opened the door quietly so as (not disturb) ______ the sleeping child.

When he opened the door, he used too much force and () the key.

A、trailed

B、varied

C、twisted

D、wicked

Which of the italicized parts indicates CONTRAST？(2013)

A．She opened the door and quietly went in.

B．Victoria likes music and Sam is fond of sports.

C．Think it over again and you"ll get an answer.

D．He is somewhat arrogant, and I don"t like this.

The door opened and in ______.

A．he came

B．came he

C．did he come

D．did Mr. Smith come

As soon as he opened the door, a______of cold air swept through the house.

A．flow

B．movement

C．rush

D．blast