Tests have proved that caffeine affects the body by increasing the he-考呗网题库移动版

单选题 Tests have proved that caffeine affects the body by increasing the heart rate and rhythm, which'__________ affects the circulatory system.

A．in turn
B．in return
C．turn back
D．as a result

参考答案A

解析:

单选题 He was driving very fast because he was of the fact that there was a speed limit.

A．innocent
B．aware
C．ignorant
D．sure

单选题 Malaria, it is true, has been practically__________in thirteen countries, including the United States, and is under attack in many others.

A．wiped out
B．died out
C．put out
D．kept out

单选题 Mobility is one of the characteristics often __________ executives, and they must accustom themselves to moving quite regularly.

A．demanded of
B．asked for
C．expected from
D．called for