Experiments have to be made under carefully _____ conditions .A.treatedB.suppliedC.re

Scientists have done countless experiments to show that praise is far ______ (effective) than criticism in improving human behavior．

What can be said about the experiments at Rocky Mountain Arsenal？

A) They have no practical value in earthquake prevention.

B) They may have practical value in earthquake prevention.

C) They are certain to have practical value in earthquake prevention.

D) The article does not say anything about their practical value in earthquake prevention.

A.As a whole

B.As a rule

C.On the average

D.By all means

A.countless

B. countable

C.counting

D.count

A have conducted

B have been conducted

C had conducted

D had been conducted

A. As a whole

B. As a rule

C. On the average

D. By all means

After some experiments, the doctors found that ______.

A. the influenza could be cured like other types of influenza

B. the influenza must be treated in a special way

C. the influenza did not have to be treated

D. the influenza could not be cured by any known medicine

Section B

Directions: In this section, there are 10 incomplete sentences. For each sentence there are 4 choices marked A, B, C and D. Choose the one that best completes the sentence. Then mark the corresponding letter with a single bar across the square brackets on your rnachine-scoring ANSWER SHEET.

Numerous experiments have demonstrated that mass is ______ to energy.

A．convertible

B．exchangeable

C．transplantable

D．conceivable