I met Anna two years ago.She is_____ good friend.

We hadn't met for 20 years, but I recognized her ___________ I saw her .

A) the moment B) for the moment C) the moment when D) at the moment when

A.He is Jack

B.This is Jack

C.She is Sue

D.You must have met each other before

ago.

(A) seriously (B) heavily (C) badly (D) severely

so many Americans from being as happy as one might expect, it seems to me that there are two causes.

A) why it does B) what it does

C) what it is D) why it is

When I try to understand ________ that prevents so many Americans from being as happy as one might expect, it seems to me that there are two causes.

A) why it does B) what it does C) what it is D) why it is

Anna was reading a piece of science fiction, completely _______ to the outside world.

A) having been lost B) to be lost C) losing D) lost

体内能生成一碳单位的氨基酸是Ser，Gly，His，Trp，Met。()

For more than 20 years, we've been supporting educational programs that from kindergartens to colleges.

A) spread B) shift C) move D) range

Fifty years ago, wealthy people liked hunting wild animals for fun ____________ sightseeing.

A) rather than to go B) more than going C) other than going D) than to go

it is possible to test this medicine on human patients.

(A) since (C) after

(B) before (D) when