As a matter of rule, the scrap value of a vessel can hardly be at ________ with the sound value.

A、par

B、bearish

C、collapse

D、rally

As everyone knows, the exchange ________ fluctuates almost daily.

A、ration

B、ratio

C、rate

D、interest

As soon as it started to rain we turned round and _________ home.

A、made for

B、called for

C、cared for

D、searched for

As scheduled, the communications satellite went into _________ round the earth.

A、circle

B、orbit

C、path

D、course

As far as the rank of position is concerned, an associate professor is ________to a professor, though they are almost equally knowledgeable.

A、attached

B、subsidiary

C、previous

D、inferior

As a salesman, he works on a (an) ________ basis, taking 10% of everything he sells.

A、income

B、commission

C、salary

D、pension

As is well-known, knowledge is the __________condition for expansion of mind.

A、indispensable

B、indefinite

C、inevitable

D、impossible

As all of us know, color-blind people often find it difficult to ________ between blue and green.

A、separate

B、distinguish

C、compare

D、contrast

As I was just getting familiar with this job, 1 had_________ to ask my boss.

A、many

B、most

C、much

D、more

As a defense against air-pollution damage, many plants and animals_________ a substance to absorb harmful chemicals.

A、relieve

B、release

C、dismiss

D、disclose