Compare the differences between PAM and BLOSUM matrices.

A.culture

B.river

C.mountain

D.road

We will ______ on the weather and have the party outdoors.

A．take a chance

B．make a difference

C．play a part

D．have an advantage

Whether you go or not does not () .

A make a difference

B make difference

C make different

D make differences

It is stated directly in the passage that older people should ______.

A．be treated differently in different cultures

B．enjoy a similar lifestyle

C．be ignored as society changes

D．be valued by the younger generations

It is one thing to accuse a person of a certain crime, but ______.

A．proving it is different

B．how to give proof is no easy

C．when to prove it is difficult

D．to prove it is quite another matter

The author mentioned the tornado in Edmonton, Canada in order to ______.

A．explain different types of weather

B．show that tornadoes occur frequently in Canada

C．indicate the tornado are common in summer

D．give an example of a damaging storm

Because slogans are "social symbols" they ______.

A．can have different meanings in different cultural and economic settings

B．are widely used as status symbols

C．can be used to demonstrate high social standing

D．are perceived as difficult to grasp

A.areas

B.countries

C.religions

D.cultural backgrounds

Passage Three

A.A comparison between fish and warm-blooded animals.

B.The difference between saltwater and freshwater environments,

C.The importance of fish to human beings.

D.How water has affected the development of fish.

A．Because Chinese laborers grew to a large number.

B．Because most Chinese were different in their physical appearance and dresses.

C．Because Chinese were thought to steal job opportunities from westerners.

D．Because Chinese in America were mostly males.